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Q.

Three charged particles A, B and C with charges −4q, 2q  and −2q  are present on the circumference of a circle of radius d . The charged particles A, C and centre O of the circle formed an equilateral triangle and point B is diametrically opposite to point C as shown in figure. Electric field at O along X-direction is

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answer is 4.

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Detailed Solution

Ex=K4qd2cos300+K2qd2cos300+K2qd2cos300 =K4qd2×32+K2qd232+K2qd232                                                           =K.8qd232                                                           =14π∈08q3d22                                                             Ex=3qπ∈0d2
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