A non-uniform magnetic field B is symmetric about an axis of circular loop. As one moves from left to right field continuously spreads away from the axis. A current circular loop is placed such that its axis coincides with the symmetry axis of the field as shown. The bold line (for loop) is facing the reader whereas the dotted line is away from the reader. the magnetic force acting on the loop is :

Options

A. towards positive X axis
B. towards negative X axis
C. towards + Y axis
D. zero

Answer

B

Explanation

Net force due to `B_(x)` = compenent =0
Force due to `B_(y)` component on each small current segmebt in towards negative x-axis.