Force between two unit pole strength placed at a distance of one me...

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Force between two unit pole strength placed at a distance of one metre is
\( \mathrm{P} \)
(1) \( 1 \mathrm{~N} \)
(2) \( \frac{10^{-7}}{4 \pi} N \)
W
(3) \( 10^{-7} \mathrm{~N} \)
(4) \( 4 \pi \times 10^{-7} \mathrm{~N} \)
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