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what is polarisability?????????how is it related to polarisation???

Electric polarizability is the relative tendency of a charge distribution, like the electron cloud of an atom or molecule, to be distorted from its normal shape by an external electric field, which is applied typically by inserting the molecule in a charged parallel-plate capacitor, but may also be caused by the presence of a nearby ion or dipole

The electronic polarizability ?  is defined as the ratio of the induced dipole moment  p of an atom to the electric field  E  that produces this dipole moment.

                        p = ? E