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Three identical bar magnets each of magnetic moment M, are placed in the form of an equilateral triangle with North Pole of one touching the south pole of the other (figure). The net magnetic moment of the system is.

Option: 1

Zero


Option: 2

3 \mathrm{M}


Option: 3

\mathrm{\frac{3 M}{2}}


Option: 4

\mathrm{M} \sqrt{3}


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Vector sum along regular polygon.

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