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22/01/2022 1:42 pm
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Two particles A and B having charges 20 μC and -5 μC respectively are held fixed with a separation of 5 cm. At what position a third charged particle should be placed so that it does not experience a net electric force?
(1) At 5 cm from 20μC on the left side of system
(2) At 5 cm from -5μC on the right side
(3) At 1.25 cm from -5μC between two charges
(4) At mid point between two charges
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22/01/2022 1:45 pm
Correct answer: (2) At 5 cm from -5μC on the right side
Explanation:
Null point is possible only right side of –5µC
EN = +\(\frac{k(-5μC)}{x^2}\) + \(\frac{k(20μC)}{(5+x)^2}\) = 0
x = 5 cm