Assertion :A charged particle can be accelerated in a cyclotron by the alternate distribution of the field. Reason: Energy of charged particle is increased by the field applied.

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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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
By alternating the field directions, the force on the particle is kept such that the radius of its path keeps on increasing before leaving the chamber. This is made possible because the speed of the particle increases as alternating electric field always accelerates the particle. Thus, electric field increases the energy of the particle. Thus, both assertion and reason are correct and reason is the correct explanation of assertion.

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