At a distance of $10\, cm $ from a long straight wire carrying current, the magnetic field is $0.04\, T$. At the distance of $40\, cm$, the magnetic field will be....$T$
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(a) $B\, \propto \,\frac{1}{r} \Rightarrow \frac{{{B_1}}}{{{B_2}}} = \frac{{{r_2}}}{{{r_1}}} \Rightarrow \frac{{0.04}}{{{B_2}}} = \frac{{40}}{{10}} \Rightarrow {B_2} = 0.01\,T$
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