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Standard XI

Physics

Torque on a Dipole

An electric d...

Question

An electric dipole is placed at an angle of $30 °$ with an electric field intensity of $2 \times 10^{5} N / C$ . It experiences a torque equal to $4 N m .$ The charge on the dipole, if the dipole length is $2 c m$ , is

5 m C

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7 μ C

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8 m C

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2 m C

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Solution

The correct option is D $2 m C$
Torque on electric dipole placed in electric field is,
$τ = P E sin θ τ = q l E sin θ 4 = q \times 2 \times 10^{- 2} \times 2 \times 10^{5} sin 30 ° \Rightarrow q = 2 m C$

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An electric dipole is placed at an angle of 30° with an electric field intensity of2 × 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is

The correct option is D 2 mCTorque on electric dipole placed in electric field is, τ = PE sin θτ = qlE sin θ 4=q×2×10−2×2×105 sin 30°⇒q = 2 mC

An electric dipole is placed at an angle of $30 °$ with an electric field intensity of $2 \times 10^{5} N / C$ . It experiences a torque equal to $4 N m .$ The charge on the dipole, if the dipole length is $2 c m$ , is

The correct option is D $2 m C$
Torque on electric dipole placed in electric field is,
$τ = P E sin θ τ = q l E sin θ 4 = q \times 2 \times 10^{- 2} \times 2 \times 10^{5} sin 30 ° \Rightarrow q = 2 m C$