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A \( 0.5 \) long metal rod PQ completes the circuit as shown in the...
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A \( 0.5 \) 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 \( 0.15 \mathrm{~T} \). If the resistance of the total circuit is \( 3 \Omega \), calculate the force needed to move the rod in the direction as indicated with a constant speed of \( 2 \mathrm{~ms}^{-1} \).
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