Q.

A current-carrying, straight wire is kept along the axis of a circular loop carrying a current. The straight wire

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a

will exert an outward force on the circular loop

b

will exert an inward force on the circular loop

c

will exert a force on the circular loop parallel to itself.

d

will not exert any force on the circular loop

answer is C.

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Detailed Solution

Magnetic field due to straight current carrying conductor is concentric circles which is along the tangent to the loop. Hence, required force is zero.

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