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An electric dipole P→ = pi^ is placed at the origin. A point charge +Q is placed at point A (–a, b). Then the ratio ba for which the electric field at B(0,b) will be zero is

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a

apQ12

b

pQa13

c

pQ13

d

QaP13

answer is B.

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Detailed Solution

14πεo.pb3=14πεoQa2⇒b3a2=PQ⇒ba=pQa13

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