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A 0.5m long metal rod PQ completes the ...

A `0.5m` long metal rod `PQ` completes the circuit as shown in the figure. The area of the circuit is perpendicular to the magnetic field of flux density `0.15 T`. If the resistance of the total circuit is `3Omega` calculate the force needed to move the rod in the direction as indicated with a constant speed of `2 ms^(-1)`

Text Solution

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`F=(B^(2)L^(2)v)/R=((0.15)^(2)(0.5)^(2)xx2)/3=0.00375 N`
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