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Q.

A loop of flexible wire of irregular shape carrying current is placed in an external magnetic field. Identify the effect of the field on the wire.

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a

Shape of the loop remains unchanged

b

loop assumes circular shape with its plane normal to the field

c

wire gets stretched to become straight

d

loop assumes circular shape with its plane parallel to the field

answer is B.

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Detailed Solution

Magnetic force acts on every small element dl , in radially outward direction, to stretch the loop in perfect circle with its plane normal to the field.
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