In the given circuit, with steady current, the potential of point A must be

Options

A. 1 V
B. 3 V
C. 4 V
D. 2 V

Answer

D

Explanation

In the steady state condition, no current will flow through the
capacitor C.
Current in the outer circuit is `I = (2V - V)/(2R +R ) = (V )/(3R)`
Potential difference between A and B is
`V_(a) - V +V +IR =V_(B)`
`:. V_(B) -V_(A) = IR = ((V)/(3R))R = (V)/(3)`