$A$ conducting rod of length $L = 0.1 \, m$ is moving with a uniform speed $v = 0.2 \, m/s$ on conducting rails in a magnetic field $B = 0.5 \, T$ as shown. On one side,the end of the rails is connected to a capacitor of capacitance $C = 20 \, \mu F$. Then the charges on the capacitor plates $A$ and $B$ are:
- A$q_A = 0, q_B = 0$
- B$q_A = +20 \, \mu C, q_B = -20 \, \mu C$
- C$q_A = +0.2 \, \mu C, q_B = -0.2 \, \mu C$
- D$q_A = -0.2 \, \mu C, q_B = +0.2 \, \mu C$
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