What is the net force on the square coil ?

             

(a) 25×10-7N moving towards wire

(b) 25×10-7N moving away from wire

(c) 35×10-7N moving towards wire

(d) 35×10-7N moving away from wire

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Two long parallel copper wires carry currents of 5A each in opposite directions. If the wires are separated by a distance of 0.5 m, then the force between the two wires is :

(a) 10-5N, attractive                (b) 10-5N, repulsive

(c) 2×10-5N, attractive           (d) 2×10-5N, repulsive

Concept Questions :-

Force between current carrying wires
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A long wire A carries a current of 10 amp. Another long wire B, Which is parallel to A and separated by 0.1m from A, carries a current of 5 amp, in the opposite direction to that in A. what is the magnitude and nature of the force experienced per unit length of B (μ0=4π×10-7weber/amp-m)

(a) Repulsive force of 10-4N/m

(b) Attractive force of 10-4N/m

(c) Repulsive force of 2π×10-5N/m

(d) Attractive force of 2π×10-5N/m

Concept Questions :-

Force between current carrying wires
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The relation between voltage sensitivity (σv) and current sensitivity (σi) of a moving coil galvanometer is (Resistance of Galvanometer = G) 

(a) σiG=σv                            (b) σvG=σi

(c) Gσv=σi                            (d) Gσi=σv

Concept Questions :-

Moving coil galvanometer
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A, B, and C are parallel conductors of equal length carrying currents I, I, and 2I respectively. Distance between A and B is x. Distance between B and C is also x. F1 is the force exerted by B on A and F2 is the force exerted by C on A choose the correct answer:

                    

1. F1=2F2                                 

2. F2=2F1

3. F1=F2                                   

4. F1=-F2  

Concept Questions :-

Force between current carrying wires
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Two galvanometers A and B require 3mA and 5mA respectively to produce the same deflection of 10 divisions. Then

(a) A is more sensitive than B

(b) B is more sensitive than A

(c) A and B are equally sensitive

(d) Sensitiveness of B is 5/3 times that of A

Concept Questions :-

Moving coil galvanometer
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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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