| 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]: Magnetic field due to current carrying solenoid is independent of its length and cross-sectional area. |
| Reason (R): The magnetic field inside the solenoid is uniform. |
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] Magnetic field due to a solenoid having n number of turns per metre and carrying current l is \[B={{\mu }_{0}}nl\] which is independent of the length and area of cross section of the solenoid. The magnetic field inside the solenoid is uniform.
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