| Assertion (A): The magnetic field produced by a current carrying solenoid is independent of its length and area of cross-section. |
| Reason (R): Magnetic field within a very long solenoid is uniform. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: B
Solution :
Option [b] is correct. Explanation: Magnetic field inside solenoid \[\operatorname{B}={{\mu }_{0}}ni\]. It is independent of length and area of cross-section. Hence the assertion is true. Reason is also true. But it does not explain the assertion.
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