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Magnetic Field

The magnetic ...

Question

The magnetic field at a distance r from a long wire carrying a current I is 0.4T. The magnetic field at a distance 2r is

0.1 tesla

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0.2 tesla

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0.8 tesla

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1.6 tesla

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Solution

The correct option is A 0.2 tesla
$B \propto \frac{1}{r}$
$\frac{B_{1}}{B_{2}} = \frac{r_{2}}{r_{1}}$
$B_{2} = \frac{B_{1} \times r_{1}}{r_{2}} = \frac{0.4 r}{2 r} = 0.2 T$

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