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Assertion (A) : If a proton and an alpha particle enter a uniform magnetic field normally with the same velocity, the time period of revolution of the alpha particle is double than that of proton. Reason (R) : In a magneitc field the time period of revolution of a charged particle is directly proportional to its mass.

Answer»

<P>If both ASSERTION and reason are true and the reason is the CORRECT explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is FALSE .
If the assertion is false but reason is true.

Solution :`T = (2 pi m)/(qB) implies = (T_(alpha))/(T_p) = (m_(alpha))/(m_p) xx (q_p)/(q_(alpha)) = (4 m_(p))/(m_q) xx (q_p)/(2q_p) = 2/1`


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