A point charge is surrounded by eight identical charges at a distance r as shown in the figure. How much work is done by the force of electrostatic repulsion when the point charge at the centre is moved to infinity?

Question

A point charge is surrounded by eight identical charges at a distance r as shown in the figure. How much work is done by the force of electrostatic repulsion when the point charge at the centre is moved to infinity?, zero, 8 q 2 4 π ε 0 r, 8 q 4 π ε 0 r, 64 q 2 4 π ε 0 r

MARKS App · Accepted Answer

Work done = - Δ U = U i - U f = 8 × q × q 4 π ε 0 r - 0 = 8 q 2 4 π ε 0 r

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