Two spheres have radii 10 cm & 20 cm. One of the sphere is given 150 microcoulomb charge and connected by a wire. Their common potential will be- (1) 9 × 10^6 volts (2) 4.5 × 10^6 volts (3) 1.8 × 10^6 volts (4) 1.35 × 10^9 volts

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