3 V के विद्युत विभव तक आवेशित की गई 729 छोटी समान बूंदें (गोले) आपस में मिलकर एक बड़ा गोला बनाती हैं। बड़े गोले का विद्युत विभव क्या होगा?

Two capacitors C1 and C2 are charged to 100 V and 120 V respectively. When connected together in parallel with opposite polarity plates joined together, the net common potential is found to be zero. Therefore, which relation holds true?

Point charges -3Q, -q, 2q, and 2Q are placed, one at each corner of a square. The relation between Q and q for which the electric potential at the centre of the square is zero is: