Question

In the given circuit if point $C$ is connected to the earth and a potential of $+80V$ is given to the point $A$, the potential at $B$ is

• A. $10V$
• B. $20V$
• C. $30V$
• D. $40V$

Answer 1

The correct option is B $20V$

Reduction of the circuit gives


$V^{\prime }=V_B-V_C=\left(\frac{3}{3+9}\right)80=20\Rightarrow V_B-V_C=20\Rightarrow V_B-0=20\Rightarrow V_B=20V$