Assertion : If a proton and an alpha-particle enter a uniform magnetic field perpendicularly, with the same speed, then the time period of revolution of the -particleis double than that of proton. Reason : In a magnetic field, the time period of revolution of a charged particle is directly proportional to mass.

Assertion : If a proton and an alpha-particle enter a uniform magnetic

1.	Assertion : If a proton and an alpha-particle enter a uniform magnetic field perpendicularly, with the same speed, then the time period of revolution of the -particleis double than that of proton. Reason : In a magnetic field, the time period of revolution of a charged particle is directly proportional to mass.
Answer» If both ASSERTION and REASON are TRUE and the reason is the CORRECTEXPLANATION of the assertion. If both assertion and reason are true but reason is not the correctexplanation of the assertion. If assertion is true but reason is false. If the assertion and reason both are false. Answer :B

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