Positive and negative point charges of equal magnitude are kept at ...

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Positive and negative point charges of equal magnitude are kept at \( \left(0,0, \frac{\mathrm{a}}{2}\right) \) and \( \left(0,0,-\frac{\mathrm{a}}{2}\right) \), respectively.
\( \mathrm{P} \)
The work done by the electric field when another positive point charge is moved from \( (-\mathrm{a}, 0,0) \) to \( (0, \mathrm{a} \),
W 0 ) is
(A) positive
(B) negative
(C) zero
- (D) depends on the path connecting the initial and final positions
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