(a) What is the potential difference VA VB between two points A and B situated a

Question

(a) What is the potential difference VA VB between two points A and B situated at 30.0 cm and 60.0 cm respectively from a 2.80 µC point charge? Incorrect: Your answer is incorrect. What is the potential due to a point charge at a particular distance from it? V (b) Where should the point B be moved to in order to increase this potential difference by a factor of two? an infinite distance from the point charge 90.0 cm from the point charge 45.0 cm from the point charge 120.0 cm from the point charge 15.0 cm from the point charge

Explanation / Answer

Elecric potential due to a point charge Q is V = KQ/r

r is the distance

so

part A:

pot diff Va - Vb = KQ/a - KQ/b

Va - Vb = (9e9 * 2.8 e-6) * (1/0.3 - 1/0.6)

Va - vb = 42000 Volts

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at a particular distance r

V = Kq/r

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to increases V by a factor of 2, its distance mus decreases by a factor of two

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