Question

A circular loop of radius a, carrying a current i, is placed in a two-dimensional magnetic field. The centre of the loop coincides with the centre of the field. The strength of the magnetic field at the periphery of the loop is B. The magnetic force on the wire is,

• A. $\pi iaB$
  
• B. $4\pi iaB$
  
• C. $Zero$
• D. $2\pi iaB$

Answer 1

The correct option is C $Zero$

For each infinitesimal length of the current carrying loop, we can locate a diametrically opposite infinitesimal length carrying current in the opposite direction.
So, the net force is zero.