| 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 the observation point lies along the length of the current element, magnetic field is zero. |
| Reason (R): Magnetic field close to current element is zero. |
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] Since \[dB\propto sin\,\theta \], where \[\theta \] is angle between the direction of the flow of current and the line joining the elementary portion to the observation point which is zero in this case, so the magnetidc field is also zero (because sin \[\theta \] is equal to zero).
You need to login to perform this action.
You will be redirected in
3 sec
