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Solution


Q.

Assertion: The energy of charged particle moving in a uniform magnetic field does not change.
Reason: Work done by magnetic field on the charge is zero.
1 Both assertion and reason are correct and reason is the correct explanation of assertion  
2 Both assertion and reason are correct, but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true.  

Ans.

(1)

The force on a charged particle moving in a uniform magnetic field always acts in direction perpendicular to the direction of motion of the charge. As work done by magnetic field on the charge is zero, so the energy of the charged particle does not change. Thus, both assertion and reason are correct and reason is the correct explanation of assertion.