| 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 force is zero, the charged particle follows linear path. |
| Reason (R): A charged particle enters in a uniform magnetic field, whose velocity makes an angle \[\theta \] with magneticd field will cover a linear path. |
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: C
Solution :
[c] When charged particle enters the uniform field they makes angle \[\theta \] with the field. Then its path is decided by combined effect of two component of velocity. \[v\,\,cos\,\theta \] parallel to the field. Due to the parallel field the charge will follow a linear path and due to the perpendicular component \[(v\,\,\sin \,\theta )\] of the field will be circular. This results in a helical path whose axis is parallel to the parallel component of the field.
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