A) \[4\times {{10}^{-8}}T\]
B) \[8\times {{10}^{-8}}T\]
C) \[12\times {{10}^{-8}}T\]
D) \[16\times {{10}^{-8}}T\]
Correct Answer: B
Solution :
\[i=2A,\,r=5\,m\] Magnetic field due to a straight wire \[B=\frac{{{\mu }_{0}}i}{2\pi r}\] \[=\frac{4\pi \times {{10}^{-7}}\times 2}{2\pi \times 5}\] \[=\frac{2\times {{10}^{-7}}\times 2}{5}\] \[=0.8\times {{10}^{-7}}\] \[=8\times {{10}^{-8}}T\]
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