A) \[{{10}^{-5}}T\]
B) \[{{10}^{-7}}T\]
C) \[2\times {{10}^{-7}}T\]
D) \[2\times {{10}^{-5}}T\]
Correct Answer: A
Solution :
(a) \[{{10}^{-5}}T\] Here, \[l=1A,x=2\,cm=0.02\,cm\] Magnetic field, \[B=\frac{{{\mu }_{0}}l}{2\pi x}\] \[=\frac{4\pi \times {{10}^{-7}}\times 1}{2\pi \times 0.02}=100\times {{10}^{-7}}={{10}^{-5}}T\].
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