Magnetic field intensity of a shot magnet at a distance 1 m. on axial line is 1 Oersted. At a distance 2 m. on the same line the intensity in Oersted is then :-

0.75

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0.125

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0.25

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0.5

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Solution

The correct option is B 0.125
$B \times \frac{1}{r^{3}}$

$\frac{B_{2}}{B_{1}} = {(\frac{r_{1}}{r})}^{3}$

$B_{2} = 0.125$ oersted

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Magnetic field intensity of a shot magnet at a distance 1 m. on axial line is 1 Oersted. At a distance 2 m. on the same line the intensity in Oersted is then :-

The correct option is B 0.125B×1r3 B2B1=(r1r)3 B2=0.125 oersted

The correct option is B 0.125
$B \times \frac{1}{r^{3}}$

$\frac{B_{2}}{B_{1}} = {(\frac{r_{1}}{r})}^{3}$

$B_{2} = 0.125$ oersted