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A rectangular loop with a sliding connec...

A rectangular loop with a sliding connector of length `l = 1.0 m` is situated in a uniform magnetic field `B = 2T` perpendicular to the plane of loop. Resistance of connector is `r = 2 Omega`. Two resistances of `6Omega` and `3Omega` are connected as shown in . The external force required to keep the connetor moving with a constant velocity `v = 2 m s^(-1)` is

A

6 N

B

4 N

C

2 N

D

1 N

Text Solution

Verified by Experts

The correct Answer is:
C

Motional emf e = Blv = `2xx1xx2=4V`
`R_(eq)=2+2=4Omega`
`I=4/4=1A`
`F=BIl=2xx1xx1=2N` (Toward left).
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