| ASSERTION: When the observation point lies along the length of the current element, magnetic field is zero. |
| REASON: Magnetic field close to current element is zero. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: C
Solution :
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 magnetic field is zero (because sin \[\theta \] is equal to zero).
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