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Q.

An electric dipole is placed at an angle of 30° with an electric. field intensity 2 x 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is :

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a

5 mC

b

7 μC

c

8 mC

d

2 mC

answer is D.

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Detailed Solution

τ=PE sinθ τ=q/E sinθ 4= q x 2 x 10-2 x 2 x 105 sin 30o ⇒q=2 mC

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An electric dipole is placed at an angle of 30° with an electric. field intensity 2 x 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is :