The direction of current in conductor is given then In which direction conductor "B" will move?

Two parallel long wires carry the same current and repel each other with a force F per unit length. If both these currents are doubled and the wire separation tripled, the force per unit length becomes:

If "L" is length of a wire with cross sectional area A carrying "n" number of charge carriers per unit volume moving with velocity v, then current through it is given as:

With a force of 1mN. If both currents are doubled, the force of attraction will be:

Two long straight wires are parallel and carry current in the same direction. The currents are 8.0 and 12A and the wires are separated by 0.4 cm. The magnetic field in tesla at a point midway between the wires is:

If current carrying conductor is placed perpendicular to the magnetic field, the force experienced by it will be:

The force on a charge particle moving parallel to magnetic field is:

The magnetic field a distance 2 cm from a long straight current carrying wire is 2.0 x 10^-5 T. The current in the wire

The magnetic field outside a long straight current carrying wire depends on the distance "R" from the wire according to:

The figure shows a uniform magnetic field "B" directed to the left and a wire carrying a current into the page. The magnetic force acting on the wire is:

The force exerted on a wire of one meter length carrying one ampere current placed at right angle to the field is called:

The diagram shows a wire, carrying an electronic current I, placed between the poles of a magnet. In which direction does the force on the wire act?

If current flows from top towards bottom through a wire then the direction of magnetic lines of force would be:

A magnetic field acts on a charged particle so as to change its:

^{The magnetic force on an electron travelling with 10^6ms-1} parallel to the field of strength lwb m^-2 is

When charge particle enters in the uniform magnetic field, the magnetic force will be equal:

Which one of the following particles moving in the magnetic field cannot be deflected:

An electron moves at 2x10 ² m/s perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

An electron travels due north through a vacuum in a region of uniform magnetic field B that is also directed due north. It will:

A charged particle is projected at an angle into a uniform magnetic field. Which of the following parameters of the charged particle · will be affected by the magnetic field:

When a charge particle enter in a magnetic field at an angle of 45° then its path in magnetic field will be:

An electron is moving north in a region where the magnetic field is south. The magnetic force exerted on the electron is:

A proton entering a uniform magnetic field B in the direction of B will move along a

Force on a moving charge in a uniform magnetic field will be half of its maximum value, when the angle between V and B is :

The magnetic force acting on a unit +ve charge moving at right angle to the magnetic field with unit velocity is called:

The magnetic force is simply a:

The "e/m" of a proton is:

The radius of an orbit of an electron moving at a rate of 2. 0 x 107 ms-1 in uniform magnetic field of 1. 20 X 10-3 T?

When an electron and a proton having same momentum enter a magnetic field at right angles, then if "r.'' and "rb" represents the radii of curvatures for electrons and protons respectively then:

Four particles enter in a uniform magnetic field perpendicularly with same speed. Which is deflected the most?

Charge to mass ratio of neutron is:

When a charged particle is project perpendicular to a uniform magnetic field, the radius of the circulating path it traverses is proportional to:

An electron with a velocity "v" is perpendicular to a field moves in a circular path of radius "r". When its velocity is doubled and the magnetic field strength is halved, the radius of the circular path becomes:

If we double the applied magnetic field, the e/m of electron will be:

A proton moves with a velocity "v" in a perpendicular magnetic field of strength is increased to 28. If the proton still moves in the same circular path its kinetic energy will:

An electron of mass "m" and charge "e" is moving in a circle of radius "r" with speed "v" in a uniform magnetic field strength "B". Then :

A proton and a particle are projected into a uniform magnetic field with velocities perpendicular to the magnetic field. If they both move in circles of equal radii the ratio of their momentum Pp/P α Should be:

A proton moves in a magnetic field with kinetic energy "E". The kinetic energy of an a particle, to orbit in the same circular path must be:

If an electron and a proton enter into a magnetic field perpendicularly with the same momentum:

Four particles enter in a uniform magnetic field perpendicularly with same speed. Which particle has largest radius?

An electron is launched with velocity V in a uniform magnetic field B . The angle θ between V and B is between 0 and 90°. As a result, the electron follows a helix, its velocity vector v returning to its initial value in a time interval of:

Magnetic flux passing normally, through a unit area is called:

1 weber is the same as:

The unit of permeability of free space is:

Weber per meter square is equivalent to:

A charge in uniform motion produces:

Units of a magnetic field might be:

The S .I. unit of magnetic flux is:

One tesla is equal to:

The unit of the quantity ΔΦ/Δt are equivalent to those of:

Which of the following is a vector quantity?

Magnetic density at a point due to the current carrying conductor be determined by:

At which angle the magnetic flux will be half of its maximum value:

A rectangular loop of wire with dimensions 0.2m x 0.5m is placed in a uniform magnetic field of 2T. The magnetic field is perpendicular to the plane of loop. What is flux in the loop?

The S.I unit of magnetic flux density is:

A magnetic field CANNOT:

The unit of permeability of free space is:

The unit of"E/B" is:

If charge particle of mass "m" is free to move in an electric field then its acceleration is given by

An electron enters a region where the electric field "E" is perpendicular to the magnetic field "B". It will suffer no deflection if:

A uniform electric field and magnetic field are parallel and point in the same direction. An electron with velocity "v" projected in the same direction will:

J. J. Thomson's experiment, involving the motion of an electron beam in mutually perpendicular E and B fields, gave the value of:

A charged particle enters in parallel direction to an electric field and a magnetic field such that both fields are parallel to each other. Then force on the charge is:

According to Faraday’s law of electromagnetic induction:

“The average emf induced in a conducting coil of N loops is equal to the negative of the rate at which the magnetic flux through the coil is changing with time.” Is the statement of?

ΔΦ/Δt has same unit as that of:

Current can be induced in a coil by changing the area of coil placed in:

The value of the induced emf is directly proportional to the rate of change of:

Faraday’s law deals with:

A coil having 500 square loops, each of side 10cm, is placed normal to a magnetic field which is increasing at the rate of 1.0 tesla per second. The induced emf is:

The average e.m.f induced in a conducting coil of N loops is equal to the negative of the rate at which the magnetic flux through the coil is changing with time. This statement is:

A 1 m2 circular coil of 10 loops is placed parallel to changing magnetic felid at 0.3 Tis, the induced emf is

According to Faraday’s law, the total charge induced in a conductor that is moved in a magnetic field depends upon:

The emf induced in a metal ring whose flux is changing at the rate of 1 wb/s is:

Faradays law is based upon the law of conservation of:

When constant current flows in primary of transformer then emf induced across secondary of transformer is:

For a good transformer, the material of the core should has the hysterics loop of:

Purpose of step down transformer is to make the:

Which one of the following is correct for a step down transformer:

Which one is the correct relation for the transformer:

For transformer, if Ns/N p = 2 : l then 1p/1s =

The coils of a transformer are:

A transformer:

The core of a transformer is made of soft iron because:

A transformer changes 12V to 18OOV and there are 6000 turns in secondary coil, the no. of turn on primary coil is:

In ideal transformer when potential difference is double the current is:

For an ideal transformer:

In the actual transformer, the output is always:

The practical application of the mutual induction phenomena is:

The number of turns in a secondary coil is twice the number of turns in primary coil. An a.c source of 200 V is connected across the primary. The voltage across secondary is:

The turn ratio in a step up transformer is 4: 1. On passing a current of 4 A in the primary, the current in secondary will be:

Turns ratio of a step up tiansformer is 50. If 220 V A.C. is applied to its primary coil, voltage in the secondary coil will be:

A generator supplies 100 V to the primary coil of a transformer. The primary has 50 turns and the secondary has 500 turns. The secondary voltage is:

A transformer steps down 200 volt to 22V to operate a device of resistance 220 n then current drawn from mean by primary coil will be:

In an ideal 1:8 step down transformer, the primary power is 10 kW and the secondary current is 25 A. The primary voltage is:

Two different loops are concentric and lie in the same plane. The current in the outer loop is clockwise and increasing with time. The induced current in the inner loop then, is

The direction of the induced current in a certain coil can easily be found by using:

In Faraday’s law ε= -N (∆∅)/∆t negative sign can be explained by:

The direction of an induced current is always such that the magnetic field on it tends to oppose the change in the strength of magnetic field belonging to primary current is the statement for: