Electrostatics 2 Question 11

12. Positive and negative point charges of equal magnitude are kept at $(0,0, a / 2)$ and $(0,0,-a / 2)$, respectively. The work done by the electric field when another positive point charge in moved from $(-a, 0,0)$ to $(0, a, 0)$ is

$(2007,3 M)$

(a) positive

(b) negative

(c) zero

(d) depends on the path connecting the initial and final positions

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Answer:

Correct Answer: 12. (c)

Solution:

  1. $A \equiv(-a, 0,0), B \equiv(0, a, 0)$

Point charge is moved from $A$ to $B$

$$ V_{A}=V_{B}=0 \Rightarrow W=0 $$

or the correct option is (c).



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