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AB and CD are smooth, parallel rails, se...

`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`

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