A) \[2\pi \times {{10}^{-3}}T\]
B) \[2\pi \times {{10}^{-5}}T\]
C) \[4\pi \times {{10}^{-2}}T\]
D) \[4\pi \times {{10}^{-3}}T\]
Correct Answer: A
Solution :
Magnetic field at the axis inside the solenoid \[B={{\mu }_{0}}\,ni\] Here, \[n=10\,\,turns/cm=1000\text{ }turns/m,\] \[\therefore \] \[B\times 4\pi \times {{10}^{-7}}\times 1000\times 5\] \[=2\pi \times {{10}^{-3}}T\].
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