Assertion :If a charged particle is released from rest in a region of uniform electric and magnetic fields parallel to each other, it will move in straight line. Reason: The electric field exerts no force on the particle but the magnetic field does.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Due to electric field, the force is $\to F = q \to E$ in the direction of $\to E$ .
Since $\to E$ is parallel to $\to B$ , the particle velocity $\to v$ (acquired due to force $\to F$ ) is parallel to $\to B$ .
Hence $\to B$ will not exert any force since $\to v \times \to B = 0$ and the motion of the particle is not affected by $\to B$ .

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Choose the most appropriate correct option:

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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