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Figure shows a conducting rod of negligi...

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 magnitude of the force required to move the conducting rod at constant speed 5cm/s at the same instant `t=2s`, is equal to

A

`0.096N`

B

`0.12N`

C

`0.08N`

D

`0.064N`

Text Solution

Verified by Experts

The correct Answer is:
C
`i=e_("net")/R=0.08/((1)(30+30+20)xx10^-2)`
`=0.1A`
`F=ilB`
`=(0.1)(0.2)(4)=0.08N`
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