Three point charges +q, +2q and –3q are placed at the three vertices of an equilateral triangle of side a. The total electrostatic potential at the centroid of the triangle is:
Two charges 3 × 10–8 C and –2 × 10–8 C are located 15 cm apart. At what point on the line joining the two charges is the electric potential zero? Take the potential at infinity to be zero.
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