(A) : A nonconducting ring having charge q uniformly distributed is rotated about an axis passing through its center and perpendicular to its plane. This ring is placed on smooth x-y plane. This ring can be stopped by a uniform magnattic field applied along x or y axis depending on sense of rotation.
(R) : The magnetic torque is expresed as `barMbarB` .

Options

A. Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'.
B. Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
C. 'A' is true and 'R' is false
D. 'A' is false and 'R' is false

Answer

D