Electric Charges and Fields - Result Question 32

32. An electric dipole, consisting of two opposite charges of 2×106C each separated by a distance 3cm is placed in an electric field of 2×105N/C. Torque acting on the dipole is

(a) 12×101Nm

(b) 12×102Nm

(c) 12×103Nm

(d) 12×104Nm

[1995]

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Answer:

Correct Answer: 32. (c)

Solution:

  1. (c) Charges (q)=2×106C,

Distance

(d) =3cm=3×102m and

electric field (E)

=2×105N/C.

Torque (τ)=pE=qdE

T=(2×106)×(3×102)×(2×105)

=12×103Nm.



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