A)
B)
C)
D)
सही उत्तर: A
$ B _{inside}=\frac{{\mu_0}id}{2\pi R^{2}} $
$ B _{in}\propto d $
$ B _{out}=\frac{{\mu_0}i}{2\pi d} $
$ B _{out}\propto \frac{1}{d} $
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