| Assertion (A): The energy of a charged particle moving in a uniform magnetic field remains constant. |
| Reasoning (R): Work done by the magnetic field on the charge is zero. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
| Option [a] is correct. |
| Explanation: 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. |
| So work done by the magnetic field, |
| W = FS cos\[\theta \] = FS cos \[{{90}^{o}}\] = 0 |
| So, the energy of the charged particle does no change. |
| Both, assertion and reason are true and reason also explains the assertion. |
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