1.

An electric dipole of dipole moment p is placed in a uniform electric field E. Initially the dipole is aligned parallel to the field. The dipole is now rotated so that it becomes antiparallel to the field. Work required to be done on the dipole by an external agency is

Answer»

– 2pE
PE
pE
2pE

Solution :`W = u_2- u_1= (-pE COS 180^@ ) - (- pE cos 0^@) = 2pE`


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