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Two magnetic isolated north poles each of strength in ampere-meter are placed one at each of two vertices of an equilateral triangle of side a. The resultant magnetic induction at third vertex is
(1) \( \frac{\mu_{0}}{4 \pi} \cdot \frac{m}{a^{2}} \)
(2) \( \frac{\mu_{0}}{4 \pi} \cdot \frac{\sqrt{2} m}{a^{2}} \)
(3) \( \frac{\mu_{0}}{4 \pi} \cdot \frac{\sqrt{3} m}{a^{2}} \)
(4) \( \frac{\mu_{0}}{4 \pi} \cdot \frac{m}{a^{2}} \)
\( \mathrm{P} \)
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