There long straight wires A, B and C are carrying current as shown figure. Then the resultant force on B is directed 

                          

(a) Towards A

(b) Towards C

(c) Perpendicular to the plane of paper and outward

(d) Perpendicular to the plane of paper and inward

Concept Questions :-

Force between current carrying wires
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Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its direction is reversed. The distance is also increased to 3d. The new value of the force between them is-

1. -2F                           

2.  2F/3

3. -2F/3                           

4. -F/3

Concept Questions :-

Force between current carrying wires
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Current i is carried in a wire of length L. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field B will be:

1. LiB22                     2. Li2B2

3. L2iB4π                     4. Li2B4π

Concept Questions :-

Current carrying loop : Force and torque
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Two thin, long, parallel wires, separated by a distance ‘d’ carry a current of ‘i’ A in the same direction. They will

(a) Attract each other with a force of μ0i2/2πd2

(b) Repel each other with a force of μ0i2/2πd2

(c) Attract each other with a force of μ0i2/2πd

(d) Repel each other with a force of μ0i2/2πd

Concept Questions :-

Force between current carrying wires
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Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is

 

(a) 10-3N

(b) 2.5×10-3N

(c) Zero

(d) 1.5×10-3N

Concept Questions :-

Force between current carrying wires
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A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85μA and subjected to a magnetic field of strength o.85 T. Work done for rotating the coil by 180 against the torque is 

(a) 9.1 μJ

(b) 4.55μJ

(c) 2.3μJ

(d) 1.5μJ

Concept Questions :-

Magnetic moment
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An arrangement of three parallel straight wires placed perpendicular to the plane of paper carrying the same current I along the same direction as shown in the figure. Magnitude of force per unit length on the middle wire B is given by:

1. μoi22πd

2. 2μ0i2πd

3. 2μoi2πd

4. μoi22πd

Concept Questions :-

Magnetic field due to various cases
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A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the center of loop is B. It is then bent into a circular coil of n turns. The magnetic field at the centre of this coil of n turns will be

(a) nB                (b) n2B

(c) 2nB              (d) 2n2B

Concept Questions :-

Magnetic field due to various cases
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An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57×10-2 T. If the value of e/m is 1.76×1011 C/kg, the frequency of revolution of the electron is

(a) 1 GHz              (b) 100 MHz

(c) 62.8 MHz         (d) 6.28 MHz

Concept Questions :-

Lorentz force
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A square loop ABCD carrying a current i, is placed near and coplanar with a long straight conductor XY carrying a current I, the net force on the loop will be:

           

1. μ0Ii2π              2. 2μ0IiL3π

3. μ0IiL2π            4. 2μ0Ii3π

Concept Questions :-

Current carrying loop : Force and torque
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