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Q.

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

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a

4N

b

1N

c

2N

d

6N

answer is C.

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Detailed Solution

i=BlVR+R1R2R1+R2;i=2×1×22+2=1A
F = Bil ; F = (2)(1)(1) = 2N

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