A) \[B\propto \frac{1}{{{x}^{3/2}}}\]
B) \[B\propto \frac{1}{{{x}^{2}}}\]
C) \[B\propto \frac{1}{{{x}^{3}}}\]
D) \[B\propto \frac{1}{{{x}^{-1/2}}}\]
Correct Answer: C
Solution :
Intensity of magnetic field \[B=\frac{{{\mu }_{0}}\,Ni\,{{a}^{2}}}{2{{({{a}^{2}}+{{x}^{2}})}^{3/2}}}\] a = radius of coil if \[x>>a\] \[\therefore \] \[B\propto \frac{1}{{{x}^{3}}}\]You need to login to perform this action.
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