`AB` and `CD` are smooth, parallel rails, separated by a distance `L` and inclined to the horizontal at an angle `theta`. A uniform magnetic field of magnitude `B`, directed vertically upwards, exists in the region. `EF` is a conductor of mass `m`, carrying a current `i`. For `EF` to be in equilibrium

(i) `i` must flow from `E` to `F`
(ii) `B i L = m g tan theta`
(iii) `B i L = m g sin theta`
(iv) `B i L = m g`

Options

A. I must flow from f to E
B. Bi l mg `tan theta`
C. Bi l = mg `sin theta`
D. Bi l = mg

Answer

B