First slide

Electrostatic potential

Question

The potential at the origin is zero due to electric field E = 20i + 30j NC^–1. The potential at point P(2m, 2m)

Moderate

A

1 V
B

-100 V
C

10 V
D

2 V

Solution

$V = - \vec{E} . \bar{dr} = - (20 i + 30 j) . (2 i + 2 j)$
= -[40 + 60] = -100 V

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