| 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 self-inductance of a long solenoid is proportional to the area of cross-section and length of the solenoid. |
| Reason (R): Self inductance of a solenoid is independent of the number of turns per unit length. |
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: C
Solution :
(c) The self inductance of a long solenoid, the core of which consists of a magnetic material of permeability \[{{\mu }_{r}}\] is given by \[L={{\mu }_{r}}{{\mu }_{0}}{{n}^{2}}Al\]
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