Question

Potential difference between $A$ and $B$ in the above circuit is:

• A. $4V$
• B. $5.6V$
• C. $2.8V$
• D. $6V$

Answer 1

The correct option is B $5.6V$

Equivalent emf (in series connection) of the circuit, $E_{eq}=6-4=2$ V

Equivalent resistance (in series connection) of the circuit, $r_{eq}=2+8=10\Omega$

Current flowing through the circuit, $I=\frac{E_{eq}}{r_{eq}}=\frac{2}{10}=0.2$ A

As $6V>4V$, thus cell of $6V$ emf dominates and current flows in anti-clockwise direction.

Potential difference between A and B, $V_{BA}=4+I\left(8\right)$

$\therefore$ $V_{BA}=4+0.2\times 8=5.6$ $V$