Two spheres A and B are having radii 5 c...

Two spheres A and B are having radii 5 cm and 10 cm and carrying charges of +5C and +15 C respectively, distributed uniformaly. Their centres are separated by 80 cm. The electric field on the line joining the centres of the spheres will be zero at a distance from the centre of A equal to

20 cm

33 cm

47 cm

29 cm

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