(1) Assertion (A) is True, Reason (R) is True; Reason (R) is a correct explanation for Assertion...

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(1) Assertion (A) is True, Reason (R) is True; Reason (R) is a correct explanation for Assertion (A)
(2) Assertion (A) is True, Reason (R) is True; Reason (R) is not a correct explanation for Assertion (A)
(3) Assertion (A) is True, Reason (R) is False.
(4) Assertion (A) is False, Reason (R) is True.
Assertion (A): If a proton and \( \alpha \)-particle enter a uniform magnetic field perpendicularly, with the same speed, then the time period of revolution of the \( \alpha \)-particle is double than that of proton.

Reason (R): In a magnetic field, the time period of revolution of a charged particle is directly proportional to mass.
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