A) increase\[l\]but decrease\[d\]
B) keep both\[l\]and d constant
C) decrease\[l\]but increase\[d\]
D) increase both\[l\]and\[d\]
Correct Answer: B
Solution :
The magnetic field produced due to a current carrying solenoid is\[B={{\mu }_{0}}ni\] It is clear that magnetic field is independent of its length and-cross-sectional area. So, when a strong current is passed through it, then both\[l\]and\[d\]remains constant.
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