Two charges +6 μC and –4μC are placed 15 cm apart as shown. At what distance from A to its right on the line joining point A and B, the electrostatic potential is zero (distance in cm) A B +6 × 10 C –6 –4 × 10 C –6 15 cm (1) 4, 9, 60 (2) 9, 45, infinity (3) 20, 45, infinity (4) 9, 15, 45

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