Calculate the work done in (i) bringing a charge of 10-9 C from a point
10 cm to a point 5 cm away from a small charge of 3 x 10-" C (ii)
moving a charge of 10-9 C from a point 2 cm from the centre of a
hollow sphere to a point 8 cm from the centre if the sphere has a radius
5 cm and a charge of 1.6 x 10-8 C.
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Electric potential difference between two point is defined as the work done in bringing unit positive charge from one point to the other point.
ΔV=
q
W
⟹W=qΔV=10μC×(90−10)
⟹W=8×10
−4
J
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