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Question

Three charges are arranged at the vertices of an equilateral triangle of side l. The dipole moment of the combination is
790319_7493b87e3595495a95889f85d4103833.png

A
Zero
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B
3ql
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C
ql/3
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D
2ql
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Solution

The correct option is B 3ql
The components of P1 & P2 along the x -axis will cancel out each other while the component along y -axis will add up
Pnet=[(ql)cos30]×2
=(ql)32×2
Pnet=3ql
Hence option (B) is correct

956423_790319_ans_1983fc6d09fc4b19952a05f495fa8e3b.png

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