Q.

 Figure shows two small electric dipoles of dipole moments P1  and  P2  parallel to each  other and placed at a distance x  apart. ‘x’ is very large, compare to  the separation  between charges then:

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a

they will attract each other 

b

Force of interaction between dipoles is of magnitude of  3P1P24πε0x4

c

Force of interaction between dipoles is of magnitude of  6P1P24πε0x4

d

they will repel each other 

answer is A, C.

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Apply concept of mutual potential energy of two electric dipoles

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