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 ?

`20 cm`

`33 cm `

`45 cm `

`60 cm `

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