$A$ long metal rod of length $L$ completes the circuit as shown. The area of the circuit is perpendicular to the magnetic field $B$. The total resistance of the circuit is $R$. The force needed to move the rod in the direction as shown with a constant speed $V$ is:
- A$\frac{B^{2} L^{2} V}{R}$
- B$\frac{BLV}{R}$
- C$\frac{BLV^{2}}{R}$
- D$\frac{B^{2} LV}{R}$
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