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Question

Three + Ve charges of equal magnitude 'q' are placed at the vertices of an equilateral triangle of side 'l' How can the system of charges be placed in equilibrium?

A
By placing a charge Q=(q/3) at the centroid of the triangle
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B
By placing a charge Q=(q/3) at the centroid of the triangle
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C
By placing a charge Q=q at a distance l from all the three charges
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D
By placing a chargeQ=q above the plane of the triangle at a distance lfrom all the three charges.
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Solution

The correct option is A By placing a charge Q=(q/3) at the centroid of the triangle
1971272_1137216_ans_8f95f23489a149d6b0a3a206e1fe9dd3.jpg

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