| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion [A]: When a charged particle moves perpendicular to magnetic field then its kinetic energy and momentum gets affected. |
| Reason (R): Force changes velocity of charged particle. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: D
Solution :
[d] When a charged particle moves perpendicular to magnetid field, it experiences a force which changes the direction of motion of the particle without changing the magnitude of velocity of the particle. Hence, kinetic energy remains constant but momentum of electron changes.
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