A conducting rod PQ of length `L=1.0` m is moving with a uniform speed `v=2.0` m/s in a uniform magnetic field `B=4.0` T directed into the paper. A capacitor of capacitor `C=10muF` is connected as shown in Fig. Then

Options

A. `q_(A)=+80muC" and "q_(B)=-80muC`
B. `q_(A)=-80muC" and "q_(B)=-80muC`
C. `q_(A)=0=q_(B)`.
D. charge stored in the capacitor increases exponentially with time.

Answer

A

Explanation

`q=CV=C(Bvl)=80muC=" constant"`
Magnetic force on electrons of the conducting rod PQ is towards Q. `:.` A is positively charged and B is negatively charged.