A) \[2\times {{10}^{-5}}Wb\]
B) \[4\times {{10}^{-7}}Wb\]
C) \[8\times {{10}^{-7}}Wb\]
D) \[8\times {{10}^{-5}}Wb\]
Correct Answer: C
Solution :
(c) \[8\times {{10}^{-7}}Wb\] Total magnetic flux. \[N\phi =Ll=20\times {{10}^{-3}}\times 4\times {{10}^{-3}}\] \[=8\times {{10}^{-5}}Wb\] Magnetic flux through the cross-section of the coil, \[\phi =\frac{8\times {{10}^{-5}}}{N}=\frac{8\times {{10}^{-5}}}{100}=8\times {{10}^{-7}}Wb\]
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