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As shown in the figure a metal rod makes...

As shown in the figure a metal rod makes contact and complete the circuit. The circuite is perpendicular to the magnetic field with `B=0.15`tesla. If the resistance is `3Omega` force needed to move the rod as indicated with a constant speed of `2m//sec` is

A

`2.75xx10^(-3)N`

B

`1.75xx10^(-3)N`

C

`3.75xx10^(-3)N`

D

`4.75xx10^(-3)N`

Text Solution

Verified by Experts

The correct Answer is:
C
`F=IlBsintheta`
`=(e)/(R)lBsintheta`
`=(Blv)/(R)lBsintheta`
`=(0.15xx0.5xx2xx0.5xx0.15xxsin90)/(3)`
`=3.75xx10^(-3)N`
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