Electromagnetism

Magnetic flux is maximum when angle between magnetic field and vector area is

We have two coils placed close to each other. When we switch on the battery connected to primary coil while keeping the sliding contact of rheostat at fixed position, the reading of Galvanometer:

The current measuring part of the Avometer consists of number of low resistances connected:

What shunt resistance must be connected across a Galvanometer of 20 Ω resistance which gives full scale deflection with 2.0 A current, so as to convert it into an Ammeter of range 10 A?

The value of permeability of free space μo is:

Force experienced by a moving change in a magnetic field is:

Force on a current carrying conductor in a uniform magnetic field is:

The sensitivity of a galvanometer can be decreased by:

The grid in the cathode ray oscilloscope _______.

The torque acting on a current carrying coil is given by _______.

Which one of the following relations is correct?

A solenoid 15 cm long has 300 turns of wire. A current of 5 A flows through it. What is the magnitude of the magnetic field inside the solenoid?

Magnetic field strength is measured in:

The force acting on the current-carrying conductor will be maximum if the angle between the magnetic field and conductor is:

If we double all the parameters of the force acting on the current-carrying conductor and θ = 90°, then the magnetic force becomes:

‘F’ is the maximum force acting on a conductor. Now if we change the direction of the conductor by making an angle of 45° with the magnetic field, then the force becomes:

1 Gauss is equivalent to:

The value of magnetic flux is 10 Wb, when magnetic lines of force containing magnetic field strength of 1T passing through unit area of 10 m², then angle between magnetic field and unit area is:

A charge projected with velocity of 10 m/s in a magnetic field of 10 T at an angle of 60°, if force exerted on charge is 2.78 x 10^-17 N, then value of charge is:

The magnetic flux linked with a solenoid of area 'A', having 'N' turns at right angle to magnetic field is:

Electric current is flowing through the circuit as shown in the figure. What will be the direction of the magnetic lines of force?

A proton is projected with a uniform velocity ‘v’ along the axis of a current carrying solenoid.

A current carrying solenoid is cut into a ratio 1:3 such that both are independently connected with the same source of current. Now if the magnetic field of the first part is “BA” while the second part respectively is “BB” then what is true?

The source of magnetic field is:

Which surface has greater magnetic flux in same magnetic field, each has an area 1 m².

Velocity selector will select only those charge particles whose velocity is given by:

The magnitude of magnetic force will be maximum on current carrying conductor in uniforrn magnetic field if conductor is placed?

If 0.5 T field is applied over an area of 2-meter square which lies at an angle of 60 degree with the field, then the resulting flux will be:

The ohmmeter of a portable digital multi meter need:

The unit of magnetic flux density is;

Which of the following statement is incorrect for any magnetic field lines?

The formula Φ = B.A represents:

In lamp and scale arrangement, mirror used is:

We define sensitivity (current) of a galvanometer as the current in p.A required to produce _deflection on a scale placed one metre away from mirror of galvanometer.

A galvanometer in which magnet rotates

In case of torque on a current carrying coil a is angle between:

In finding the value of e/m, velocity of electron can be calculated by using:

In finding the value of e/m, apparatus used is:

Magnetic field inside a solenoid is:

Unit of permeability of free space

In a velocity selector, particle pass through it if:

Pole pieces of magnet in galvanometer are made concave to make field:

The sensitivity of galvanometer can be increased by decreasing:

A solenoid 15 cm long has 300 turns, I = 5A, B=:

If an electron enters the magnetic field at right angle from left and B is into paper, electron will be deflected:

Which one of the following is not deflected by magnetic field?

Two parallel wires carrying current in opposite direction:

The relation between current I and angle of deflection in a moving coil galvanometer is :

A proper combination of a galvanometer and a series resistance acts as:

When the ohmmeter measures the infinite resistance, its pointer lies at:

An AVO meter can measure:

The resistance of shunt is:

To convert a galvanometer into a voltmeter, we connect with it a:

To convert a galvanometer into an ammeter, we connect with it a:

An AVO meter is also called:

A moving coil galvanometer can be converted into:

Such a galvanometer in which the coil comes to rest quickly after the current passed through it is called:

In a pivoted type galvanometer, the coil is pivoted between two:

In lamp and scale arrangement for measures the angle of deflection, the scale is:

Radial magnetic field is used in a galvanometer so that the galvanometer scale is:

While construction a galvanometer, the enamelled copper wire is wound on:

A moving coil galvanometer is based on the following effect of current:

To make the field stronger near the coil of the galvanometer, we place inside the coil a:

The rectangular coil of a galvanometer is made of:

The coil of a galvanometer is suspended between the poles of a U-shaped magnet which are:

The galvanometer usually consists of a:

The unit of magnetic force is:

The force on a moving charge in magnetic field is zero when angle between velocity and magnetic field is:

Force on a moving charge in magnetic field is maximum when angle between velocity and magnetic field is:

In CRO, when cathode is heated by a filament, it emits:

In CRO, when beam of electrons falls on a screen, it makes a visible spot because the screen is:

A device which can measure current, potential difference and resistance accurately is called:

To measure potential difference across a resistor, voltmeter is always connected in:

To convert a galvanometer into a voltmeter, a high resistance Rh connected in series with the galvanometer is given by:

To convert a galvanometer into an ammeter, the shunt resistance is given by:

For accurate measurement of current through a circuit, the resistance of ammeter should be:

The working of galvanometer depends upon:

When a charged particle moves through a magnetic field, the field changes the particle:

What is the current in a wire of 10 cm long at right angle to a magnetic field of 0.5 T when force acting on the wire is 5 N?

The current passing through the coil of galvanometers is directly proportional to:

The electron gun in cathode ray oscilloscope consists of:

The function of grid in cathode ray oscilloscope is:

How are the electrons produced in a cathode ray oscilloscope?

What is emitted by the hot metal filament in a cathode ray oscilloscope?

The cathode ray oscilloscope is useful for:

An instrument which can measure potential without drawing any current is called:

B_y means of waveform displayed on the screen of CRO, we can measure:

Saw toothed waveform means that its voltage:

In CRO, the output waveform of time base generator is:

The voltage applied across X-plates deflects the beam:

The voltage applied across Y-plate deflects the beam:

In CRO, there are:

The grids in CRO are at:

The anode in CRO are at:

Indirectly heated cathode means that the:

CRO works by deflecting the beam of electron as they pass through:

The force which deflects the coil of the galvanometer is called:

The device used for displaying the waveform of given voltage is:

The expression for charge to mass ratio of an electron is determined by:

The strength of magnetic field produced inside the solenoid when it has n turns per unit length and current I is:

A galvanometer can be flitrarted into a voltmeter by connecting:

A moving coil galvanometer can be converted into ammeter by connecting:

A sensitive galvanometer measures currents:

Cathode ray oscilloscope works by deflecting a beam of:

The sensitivity of a galvanometer depends upon the factors:

The sensitivity of the galvanometer can be increased by increasing the:

In case of galvanometer, the magnitude of the deflecting torque is given as:

A device used for the measurement and detection of current is called:

The expression for torque acting on a current carrying coil placed in a uniform magnetic field is equal to:

When a charged particle q is moving with velocity V in a region where there is an electric field E and magnetic field B, then the total electric and magnetic force on the particle is:

Magnetic flux due to the current carrying conductor is determined by:

One tesla is equal to:

In particle velocity method, the selected speed is equal to:

Which one is suitable for circular trajectory of a charged particle:

Force on the current carrying conductor placed in a uniform magnetic field is:

The magnetic field out of the solenoid is:

The magnetic field at the middle of the solenoid is:

A long tightly wound cylindrical coil of wire is called:

The SI unit of permeability μo is:

Charge to mass ratio (e/m) of a charged particle is also called:

Which one of the following quantities can be replaced by magnetic induction:

Magnetic flux and flux density are related by:

The total number of magnetic lines of force passing normally through a given area is called:

Ampere based his circuital law on the findings of:

A compass needle will be deflected if it is kept near:

The magnetic force experienced by a charged particle moving in a magnetic field will be maximum when it moves:

If a moving electron deflected side ways on passing through a certain region of space, can we predict the presence of a magnetic field:

The energy resides in a current carrying conductor in the form of:

A charged particle moving with velocity V in a magnetic field B experiences a magnetic force is:

A current carrying conductor surrounded by:

Ampere's law mathematically can be expressed

Two free parallel wires carrying currents in opposite direction:

The direction of the magnetic field produced by a linear current is given by:

The magnetic field at a point due to current carrying conductor is directly proportional to:

The earth magnetic field always has a vertical component except at the:

Which one of the following is the unit of magnetic induction:

If the magnetic flux is expressed in weber, then the magnetic induction can be expressed:

The e/m of an electron can be calculated by using the formula:

The e/m of an electron can be calculated if we know the value of:

When an electron is projected in a direction perpendicular to the lines of magnetic force, its path may be:

When an electron enters at right angle to the magnetic field, the magnitude of velocity:

In formula F =e (V x B) where F is:

Lorentz force means the force acting on a particle, which is:

If a charge is free to move in an electric field then acceleration produced in it will be:

When an electric charge q is placed in an electric field, it will experienced a force:

When the charge particle is projected in the direction parallel to the magnetic field, then force experienced will be:

When the charge particle is projected at right angles to the magnetic field then force experienced:

If an electron is projected in a magnetic field with velocity V, it will experience a force:

If the length of the solenoid is doubled without changing the number of turns then magnetic flux:

A long wire wound tightly on a cylindrical coil is called:

If there are n charge carriers per unit volume then the number of charge carriers in a segment of wire of length L and area A is:

Nm/A is commonly called:

The magnetic flux is measured in SI units:

The permeability of free space is measured in:

The magnetic field inside the solenoid can be increased by:

B =μonI , where n represents:

The magnetic field is uniform and stronger:

A solenoid is a coil of wire, which is:

μo is called:

Amperean path is:

Magnetic flux density at any point due to a current carrying conductor can be computed from:

Magnetic induction is defined as flux per unit area of the surface, which is:

The phenomenon of production of induced emf is called:

An emf is set up in a conductor when it:

The unit of magnetic induction B is:

The current produced by moving a loop (wire) across the magnetic field is called:

The Phenomenon by which an induced emf is produced in the conductor due to change of magnetic flux in it is called:

If the magnetic field is directed along the normal to the area, then magnetic flux is:

If a closed metallic loop is moved across a magnetic field then:

The magnitude of motional emf is given by:

Vector area is vector whose direction:

The induced current can be increased by:

Which one of the following produced first:

The induced current in a circuit depends upon:

The magnetic force experienced by a charge particle moving in a magnetic field will be maximum when it moves:

The magnetic force experienced by a charge particle moving in a magnetic field will be minimum when it moves:

Which one of the following materialism most suitable for making core of electrometer:

A magnetic field:

If a current carrying conductor is placed perpendicular to the magnetic field, it will experience a force:

A current is passed through a straight conductor, the magnetic field produced around it.The magnetic lines of force are:

A magnetic compass will be defected if it is kept near:

The strength of magnetic field around a conductor:

The direction of magnetic lines of force around a current carrying conductor is given by:

Magnetic field is a:

The direction of force on a current carrying conductor placed in a magnetic field is that of:

A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor:

Magnetic force acting on unit positive charge moving perpendicular to the magnetic field with a unit velocity is known as:

In the region surrounding a current carrying wire:

When some compass needles are placed on a cardboard along a circle with the center at the wire:

When the angle between the vector area and the magnetic field is 0O then magnetic flux is:

üo is the permeability of free space its value is:

The dimensions of magnetic flux are:

Weber is the unit of:

Tesla is the unit for measuring:

Mathematically the magnetic flux is:

The dot product of magnetic field B and vector area A is:

The force acting on one metre length of the conductor carrying unit current placed at right angle to the magnetic field is called:

The direction of magnetic lines of force are depend upon:

A changing magnetic field produce:

Who discovered a relation between magnetic and electric field:

A current carrying conductor placed in a magnetic field parallel to it, The force experienced by the conductor is: (a) F (b) FBIL = (c) F = BIL sin 0 (d) F = BIL cos 0

The sources of magnetic field are:

The name of the scientist who noted that a compass needle was deflected when placed near the current carrying conductor.

Question is given below:

Which of the following is correct?