A metallic sphere has a charge of 10 microcoulomb

Asked by admin @ 17/08/2021 in Physics viewed by 383 People

A metallic sphere has a charge of 10uC. A unit

negative charge is brought from (A) to (B), both100 cm away from the sphere but (A) beingeast of it while (B) being on west. The net workdone on the unit negative charge is(1) Zero(2) 2/10 joules(3) -2/10 joules(4) –1/10 joules

Answered by admin @ 17/08/2021

The net work done is zero
The metallic sphere forms an equipotential surface at a radius of 100 cm from the sphere.
Since the unit negative charge moves keeping the radius with the sphere constant, it moves on that equipotential surface yeilding work done as zero :)

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