Question

A work of 25 J and 30 J is done when 5 C charge is moved first to point A and then to point B from infinity. Calculate the potential difference between points A and B.

Answer 1

W_A = 25 J

W_B = 30 J, charge = Q = 5 C

Potential at point A = V₁ = `"W"_"A"/"Q"`

V₁ = `25/5 = 5` volt

Potential at point B = V₂ = `"W"_"B"/"Q"`

V₂ = `30/5 = 6` volt

Potential difference A and B = V = V₂ − V₁ 

V = 6 − 5 = 1 volt

Answer 2

W_A = 25 J

W_B = 30 J, charge = Q = 5 C

Potential at point A = V₁ = `"W"_"A"/"Q"`

V₁ = `25/5 = 5` volt

Potential at point B = V₂ = `"W"_"B"/"Q"`

V₂ = `30/5 = 6` volt

Potential difference A and B = V = V₂ − V₁ 

V = 6 − 5 = 1 volt