1.

An elastic circular wire of length \( l \) carries a current \( I \). It is placed in a uniform magnetic field \( \vec{B} \) (Out of paper) such that its plane is perpendicular to the direction of \( \vec{B} \). The wire will experience A. No force B. A stretching force C. A compressive force D. A torque

Answer»

Correct option is (B) A stretching force

We know that,

Magnetic force

F = idl x B,

the magnetic force acts radially outwards. Now if you sum up the effects on all the infinitesimal segments evidently it tries to stretch the wire.



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