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Two very small spheres A and B are charg...

Two very small spheres A and B are charged with `+10` and `+20` coulomb respecitvely and separated by a distance of 80 cm.The electric field at point on the line joining the centres of the two spheres will be zero at almost how much distance from A ?

A

20cm

B

33 cm

C

45 cm

D

60 cm

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