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  4. Force between two unit pole strength placed at a distance of one metre is

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Q. Force between two unit pole strength placed at a distance of one metre is

Magnetism and Matter

Solution:

$F=10^{-7} \times \frac{m^{2}}{r^{2}}$
$=\frac{10^{-7}(1)^{2}}{(1)^{2}}=10^{-7} N$