| 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]: The magnetic field intensity at the centre of a circular coil carrying current changes, if the current through the coil is doubled. |
| Reason (R): The magnetic field intensity is dependent on current in conductor. |
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: A
Solution :
[a] The magnetic field at the centre of circular coil is given by. \[B=\frac{{{\mu }_{0}}}{4\pi }\frac{2\pi nl}{a}\] So if current through coil is doubled then magnetic field is B' = 2B. The magnetic field also get doubled. The magnetic field is directly proportional to the current in conductor.
You need to login to perform this action.
You will be redirected in
3 sec
