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Q.

two ideal electric  dipoles  A and  B  having  their  dipole moment p1 and p2 respectively  are  placed  on a  plane  with  their  centres  at O  as shown  in the  figure  At  point  c  on  the  axis  of  dipole  A  the  resultant  electric  field  is  making  an angle  of 370 with the  axis  .The  ratio  of the dipole  moment  of A  and   B, p1p2 is   (Take(sin   (370)=35)

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a

23

b

38

c

43

d

32

answer is A.

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Detailed Solution

point C is on the axial line of  electric dipole A. so  electric field due to electric dipole B. so electric field due to electric dipole B at point C is , E2=p24πε0r3j^
Net electric field at point C is  EC=E1+E2
An net electric field is making 37o with the axis ,

tan370=E2E1=p22p1

34=p22p1

p1P2=23

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