An electric dipole is placed at an angle of 30 ° with an electric field of intensity 2 × 10 5 N C - 1 . It experiences a torque equal to 4 N m . Calculate the magnitude of charge on the dipole, if the dipole length is 2 cm .

Question

An electric dipole is placed at an angle of 30 ° with an electric field of intensity 2 × 10 5 N C - 1 . It experiences a torque equal to 4 N m . Calculate the magnitude of charge on the dipole, if the dipole length is 2 cm ., 2 mC, 8 mC, 6 mC, 4 mC

MARKS App · Accepted Answer

Torque experienced by the electric dipole is given by, τ → = p → × E → ⇒ 4 = p E sin θ ⇒ 4 = q l × 2 × 10 5 × sin 30 ° ⇒ q = 4 10 5 × 2 × 10 - 2 = 2 × 10 - 3 C = 2 mC

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