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8). 2 charges, 7.32 µC each, are located at two vertices B & C of an equilateral triangle ABC with sides 2 cm each. Another charge q is located at point A. Calculate q in micro Coulomb so that net POTENTIAL at the mid point of BC will be ZERO.
9). Three charges, + 21 uC, - 21 uC and + 21 uC are placed at A (0,5cm), B (5cm,0), C(-5cm,0). Calculate the potential energy of the whole system of charges.
10). Two charges, one is at A with - 20.81 nC and other is at B with +9* 20.81 nC are seperated by 1 m. Find the distance AC in cm for which electric POTENTIAL at point C is zero. Point C is located on line AB.
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