| ASSERTION: The magnetic field intensity at the centre of a circular coil carrying current changes, if the current through the coil is doubled. |
| REASON: The magnetic field intensity is dependent on current in conductor. |
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: A
Solution :
The magnetic field at the center of circular coil is given by \[B=\frac{{{\mu }_{0}}}{4\pi }\frac{2\pi n\,I}{a}\] So, if Current through Coil is doubled then magnetic field is B' = 2B. The magnetic field also gets doubled. The magnetic field is directly proportional to the current in conductor.
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