Assertion :Magnetic field is useful in producing parallel beam of charged particle. Reason: Magnetic field inhibits the motion of charged particle moving across it.

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.
Manetic force acts perpendicular to the direction of motion of charged particle. So, charged particles can be made to move in a circular arc before leaving the field tangential to the path. Thus, magnetic field can produce parallel beam of charged particles. Also, it will deflect the particles moving along the field. So, both assertion and reason are correct and reason is the correct explanation of assertion.

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