JEE Main 10 Jan 2019 Shift 2 Solved Paper

Charges –q and +q located at A and B, respectively, constitute an electric dipole. Distance AB = 2a, O is the mid point of the dipole and OP is perpendicular to AB. A charge Q is placed at P where OP = y and y ≫ 2a. The charge Q experiences and electrostaticforce F. If Q is now moved along the equatorial line to P' such that OP'= (

y

3

) , the force on Q will be close to : (

y

3

≫2a)