Question

In the following figure, R = $50.4\Omega$. EMF of the cell E is 1.2 V. The value and direction of current are given. If B is at zero potential, what is the potential at A?

• A. 61.00V
• B. 59.28V
• C. -59.28V
• D. -61.00V

Answer 1

The correct option is C -59.28V

Given:
Voltage of cell E, $V_E$ = 1.2 V.
Current flowing in the path, $I$ = 1.2 A.
Resistance $R$ = $50.4\Omega$.
Using Kirchoff's law's sign conventions as shown below:
$V_E-(I\times R)-V_A=0$
$⟹$$1.2-(1.2\times 50.4)=V_A$
hence, $V_A=-59.28V$.