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Question

# Charges Q1 and Q2 are near each other. We have no information of their position, nature and magnitude, all we know is Q2 experiences a force of 5N to the right. What can we infer for sure from this?

A

Q1 is a charge of -5C

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B

Q2 is a charge of +5C

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C

Q1 experiences a force of 5N to the left

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D

Q2 and Q1 are like charges

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Solution

## The correct option is C Q1 experiences a force of 5N to the left Coulomb's force must obey Newton's third law. If there are only 2 bodies, the forces on each one due to the other body must be equal and opposite. Now consider the case when Q1 is placed leftwards with respect to Q2: From action-reaction law, one can easily infer that Q1 has to experience an equal amount of force but towards left. Suppose that Q1 is now placed towards right relative to Q2 Again Q1 will experience a force towards left.

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