A) \[\frac{{{\mu }_{0}}nI}{2}\]
B) \[{{\mu }_{0}}nI\]
C) zero
D) \[2{{\mu }_{0}}nI\]
Correct Answer: A
Solution :
Intensity of magnetic field at the ends of a solenoid \[B=\frac{{{\mu }_{0}}nI}{2}\] Intensity of magnetic field at the centre of solenoid \[B={{\mu }_{0}}nI\] \[{{B}_{centre}}=2{{B}_{end}}\]
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