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An electric dipole is placed in a uniform electric field  E of magnitude  40  NC1.Graph shows the magnitude of the torque on the dipole versus the angle  θ between the field  E and the dipole moment  p. The magnitude of dipole moment p is equal to

a
2.5×10−28  Cm
b
2.0×10−25  Cm
c
1.25×10−28  Cm
d
5.0×10−28  Cm

detailed solution

Correct option is C

τ→=p→×E→        or   τmax=pEor 50×10−28=p40  or  p=1.25×10−28  Cm

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