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Gravitation vs. Electrostatics

A particle wi...

Question

A particle with a charge 2μC is hanging in air above a similarly charged conducting surface whose surface charge density is $43.3 \times 10^{- 12} C / m^{2}$ . The mass of particle is

A

1mg

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B

1g

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C

1 kg

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D

10^-2 kg

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Solution

The correct option is A
1mg

The upward electrostatic force is equal to the weight of the particle.

Eq = mg

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