GATE 2026 IN – Question 32
The potential difference between nodes $A$ and $B$ in a circuit is $v_A-v_B=5\ \mathrm V$. The work done in moving a charge of 1 coulomb from point $B$ to $A$ is ________ J. (Answer in integer.)
Practise this question in The GATE Grind →
Show answer and explanation
Correct answer: 5 to 5
Explanation
The change in potential energy is $\Delta U=q(v_A-v_B)=1\times5=5\ \mathrm J$. This equals the work required from an external agent for quasistatic motion, giving **5 J**.
The electric field does the opposite work, $-5\ \mathrm J$. The official answer uses the work supplied to move the charge.