Question

Figure shows a conducting rod of negligible resistance that can slide on smooth U-shaped rail made of wire of resistance `1Omega//m`. Position of the conducting rod at `t=0` is shown. A time dependent magnetic field `B=2t` tesla is switched on at `t=0`

The current in the loop at `t=0` due to induced emf is
A. `0.16 A`,clockwise
B. `0.08 A`,clockwise
C. `0.08 A`,anticlockwise
D. zero

Answer 1

Correct Answer - A
`(dB)/(dt)=2T//s`
`E=-(AdB)/(dt)=-800xx10^(-4)m^(2)xx2=-0.16 V`
`i=0.16/(1 Omega)=0.16 A`,clockwise