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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