A conducting ring of radius `r` and resistance `R` rolls on a horizintal surface with constant velocity `v`. The magnetic field `B` is uniform and is normal to the plane of the loop. Choose the correct option.

Options

A. (a) The induced emf between `O and Q` is `Brv`.
B. (b) An induced current `I = (2Bvr)/(R )` flows in the clockwise direction.
C. ( c) An induced current `I = (2Bvr)/(R )` flows in the anticlockwise direction.
D. (d) No current flows.

Answer

D

Explanation

(d) Induced emf between `O and Q` is
`(1)/(2)Bomega(2r)^(2) = Bomega2r^(2) = 2Bvr`.
But net induced emf in the ring will be zero. Hence no current flows in the ring.