Questions
Four equal point charges Q each are placed in the xy plane at (0, 2), (4, 2), (4, -2) and (0, -2). The work required to put a fifth charge Q at the origin of the coordinate system will be :
detailed solution
Correct option is A
W=QV=QV1+V2+V3+V4=Q14π∈0Qr1+14π∈0Qr2+14π∈0Qr3+14π∈0Qr4 =14π∈0Q212+12+122+42+122+42 =Q24π∈01+220 =Q24π∈01+225==Q24π∈01+15Talk to our academic expert!
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Two electric charges and are placed 20 cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from charge is
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