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18 Jan 2012 13:24:21 IST

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electricfields....

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positive and negative point charges of equal magnititude 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 positive, negative or zero??????

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Arjun Virmani

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18 Jan 2012 19:14:20 IST

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there is no work done.

as the displacement is not in the direction of force applied.

the displacement is Perpendicular

W= F.S

and the dot product is zero for perpendicular vectors...

The net force ( field ) is acting in the z direction and the displacement is in X-direction ( -a to 0 ) and Y-direction ( 0 to a )

thrfr no Work is done by the field!!!!!!!

Vishal U. Karve

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18 Jan 2012 20:06:50 IST

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Since initial separation from both the charges is equal, initial electric potential energy=zero;

and since final separation from both the charges is also equal, final electric potential energy=zero.

Therefore no work is required to be done against electric force.

Work done=zero.

shivansh shrivastava

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26 Jan 2012 19:44:48 IST

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With th given c0nditi0n,any circl on xy plane with centr at origin wil hav same potential at every point on its circumfrnc...sinc,+ve charg experiencs a c0nsrvativ f0rce,wrk d0ne depnds on initial n final p0int,both of whch lie on a circl,so W=0

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