Q.
Two point charges 100μC and 5μC are placed at points A and B respectively with AB=40cm. The work done by external force in displacing the charge 5μC from B to C, where BC=30cm, angle ABC=π/2 and 1/4πε0=9×109Nm2/C2
3138
204
Electrostatic Potential and Capacitance
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Solution:
Work done in displacing charge of 5μC from B to C is W=5×10−6(Vc−VB) VB=9×109×0.4100×10−6=49×106V
and VC=9×109×0.5100×10−6=59×106V
So W=5×10−6×(59×106−49×106) =−49J