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Assertion: If a proton and an electron are placed in the same uniform electric field, they experience different accelerations. Reason: Electric force on a test charge is independent of its mass.

1. If both assertion and reason are true and the reason is the correct explanation of the assertion.
2. If both assertion and reason are true but reason is not the correct explanation of the assertion.
3. If assertion is true but reason is false.
4. If the assertion and reason both are false.

Correct answer: If both assertion and reason are true but reason is not the correct explanation of the assertion.

Solution

In the same electric field, proton and electron experience equal magnitude electric force because their charges have equal magnitude. Their accelerations differ because acceleration depends on mass, and the proton is much heavier than the electron. The reason is true, but it does not fully explain the difference in acceleration.

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