Find expression for electrical field
due to dipole on an equatorial line
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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 electrostatic force F. If Q is now moved along the equatorial line to P' such that OP′=(3y) the force on Q will be close to L : (3y>>2a).
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