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Two point charges +q and -2q are placed...

Two point charges +q and -2q are placed at the vertices B and C of an equilateral triangle ABC of side 'a' as shown Obtain the expession for (i) the magnitude ,and (ii) the direction of the resultant electric field at the vertex A due to these two charges .

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The correct Answer is:
(i) ` (1) /( 4 pi in _0) (sqrt3q)/( a^(2)) (ii) 30^(@) ` from Ac
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