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Question

The figure shows equipotential surface concentric at O. The magnitude of electric field at a distance r meters from O is
1222613_25580ceef2394f2fa2782d49ed37d488.jpg

A
9r2Vm1
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B
16r2Vm1
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C
2r2Vm1
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D
6r2Vm1
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Solution

The correct option is A 9r2Vm1

160+130+120=1+2+360=660
E1=V1d1=20×10+230
E2=V2d2=3020×102=30×10020
E3=V3d3=6030×102
E1+E2+E3=2030×102+3020×102+6030×102
=102(23+32+63)V/m
=1004+9+186V/m
=100×316
=9r2V/m

1240368_1222613_ans_5d95a3cb53dc4d088c4e4b085348f6fa.jpg

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