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Q.

An electric dipole p→=8×10−9i^ C−m is placed at the origin. If electric field at a point P(a,a) is E, what is the electric field at a point Q(0,2a)

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a

25E

b

E5

c

2E

d

E

answer is A.

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Detailed Solution

EP=14π∈0pr31+3cos⁡2θHere θ=45o and γ=2a∴ E=14π∈0p(2a)3.1+32E= 14π∈0p(2a)352∴ EQ=14π∈0p(2a)3=25 E .
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