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Question

An electric dipole of moment p=(^i3^j+2^k)×1029 Cm, is at the origin. The electric field due to this dipole at r=+^i+3^j+5^k (note that rp=0) is parallel to:

A
(+^i3^j2^k)
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B
(^i+3^j2^k)
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C
(+^i+3^j2^k)
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D
(^i3^j+2^k)
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Solution

The correct option is B (^i+3^j2^k)
Since, rp=0

the given point lies on the equator of the dipole.

At an equatorial point, E is antiparallel to p

a vector parallel to E, will be antiparallel to p

Now, p=(^i3^j+2^k)×1029

Considering all four options, the only vector that is antiparallel to p, is (^i+3^j2^k)

E is parallel to (^i+3^j2^k)

Hence, (B) is the correct answer.

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