A 0 . 5 m long metal rod P Q 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 3 Ω , calculate the force needed to move the rod in the direction as indicated with a constant speed of 2 m s −1.

Question

A 0 . 5 m long metal rod P Q 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 3 Ω , calculate the force needed to move the rod in the direction as indicated with a constant speed of 2 m s −1., 5 . 78 mN, 3 . 75 mN, 4 . 95 mN, 11 . 23 mN

MARKS App · Accepted Answer

F = B 2 l 2 v R = ( 0.15 ) 2 ( 0.5 ) 2 × 2 3 = 0.00375 N = 3.75 mN

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