An electric dipole, consisting of two opposite charges of magnitude 2×10−6 C each separated by a distance 3 cm is placed in an electric field of magnitude 2×105 N/C along the direction making 900 with the field. Torque acting on the dipole is :
12×10−4Nm
12×10−2Nm
12×10−3Nm
12×10−1Nm
A
12×10−2Nm
B
12×10−3Nm
C
12×10−1Nm
D
12×10−4Nm
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Solution
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Given data,
Charges(q)=2×10−6C,
Distance(d)=3cm=3×10−2m
electricfield(E)=2×105N/C.
Torque(τ)=?
We know that
Torque(τ)to be measured
Torque=charge×distance×Electricfield
Torque(τ)=(2×10−6)×(3×10−2)×(2×105)
=12×10−3Nm
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