Two charges and are placed 15 cm apart as shown. At what …

Physics Electrostatics Potential & Capacitance All Topic Question for Revision Test MCQ (Single Correct)

Two charges and are placed 15 cm apart as shown. At what distances from A to its right, the electrostatic potential is zero (distances in cm )?

5, 9, 60

9, 45, infinity

20, 45, infinity

Text Solution

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The correct answer is:

Let the potential be zero at point P at a distance x, from the charge at A as shown in the figure. Potential at P,

The other possibility is that point of zero potential P may lie on AB produced at a distance x from the charge at A as shown in the figure.

Potential at P,

6x - 90 = 4x

2x = 90

or x = = 45 cm

Thus, electrostatic potential is zero at 9 cm and 45 cm from the charge at A. Also, potential is zero at infinity.

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