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Q.

The figure shows a long straight wire carrying a current I1 along the axis of a circular ring carrying a current I2. Identify the correct statement.

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a

Straight wires attract the ring

b

None of the above

c

Straight wires attract a small element of the ring

d

Straight wires does not attract any small elements of the ring

answer is C.

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Detailed Solution

I1  produces circular magnetic field lines current I2 is each small circular element is parallel to θ=0° magnetic field. Hence, force is zero.

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