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.