Question

20 Joule work is done to bring 2 Coulomb charge from infinity to a given point. Calculate Electric potential at that point.

Answer 1

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Work done = 10 joule

Charge = 2 coulomb

Potential of point A VA = 10 J / 2C = 5V

Given work done = 20 Joule

Charge = 2 coulomb

Potential of point A VB = 20 J / 2C = 10V

Potential differences between two point A and B is

V = VB - VA

= 10V - 5V = 5V

Work done directly from A to B.

Work done = Potential difference × charge

= 5V × 2C

= 10 Joule

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