Electrostatics Question 418

Question: A charged particle of mass 5×10−5kg is held stationary in space by placing it in an electric field of strength 107NC−1 directed vertically downwards. The charge on the particle is [EAMCET 2000]

Options:

A) −20×10−5μC

B) −5×10−5μC

C) 5×10−5μC

D) 20×10−5μC

Show Answer

Answer:

Correct Answer: B

Solution:

QE = mg ⇒Q=mgE=5×10−5×10107

=5×105mC . Since electric field is acting downward so for balance charge must be negative.

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