A) \[6.28\times {{10}^{-5}}\text{T}\]
B) \[6.28\times {{10}^{-3}}\text{T}\]
C) \[6.28\times {{10}^{-4}}\text{T}\]
D) \[6.28\times {{10}^{-2}}\text{T}\]
Correct Answer: C
Solution :
Given, \[n=25,\]\[r=10cm=0.1m,\] \[I=4A\] Magnetic field at the centre of the coil. \[B=\frac{{{\mu }_{0}}nI}{2r}\] s\[=\frac{4\pi \times {{10}^{-7}}\times 25\times 4}{2\times 0.1}\] \[=2\times 3.14\times {{10}^{-4}}=6.28\times {{10}^{-4}}T\]
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