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  4. 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 charge in moved from (-a, 0,0) to (0, a, 0) is

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Q. 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 charge in moved from $(-a, 0,0)$ to $(0, a, 0)$ is

IIT JEEIIT JEE 2007Electrostatic Potential and Capacitance

Solution:

$A \equiv (-a,0,0), B \equiv (0,a,0)$
Point charge is moved from A to B
$V_A=V_B=0$
$\therefore W = 0 $

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