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, \[n=10\,turns/cm=1000turns/m,i=5A\] \[\therefore \] \[B=4\pi \times {{10}^{-7}}\times 1000\times 5\] \[=2\pi \times {{10}^{-3}}T.\]
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