electric dipole and dipole moment questions with solutions

Showing 1–10 of 17 questions

• MCQmediumElectrostaticselectric dipole and dipole moment

  Two shorts dipoles (A, B), A having charges ± 2μC and length 1 cm and B having charges ± 4μC and length 1 cm are placed with their centres 80 cm apart as shown in the figure. The electric field at a point P, equi-distant from the centres of both dipoles is_____N/C.

  

  Options

  • Option A

    (9/16)√2 × 10⁵

  • Option B

    4.5√2 × 10⁴

  • Option C

    9√2 × 10⁴

  • Option D

    (9/16)√2 × 10⁴

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  JEE Mains 202623 January Evening Shift

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• A/ReasyElectrostaticselectric dipole and dipole moment

  Given below are two statements: one is labelled Assertion A and the other is labelled Reason R.

  Assertion

  An electric dipole of dipole moment 30 × 10⁻⁵ C m is enclosed by a closed surface. The net electric flux coming out of the surface is zero.

  Reason

  An electric dipole consists of two equal and opposite charges.

  Options

  • Option A

    Both A and R are true and R is the correct explanation of A

  • Option B

    A is true but R is false

  • Option C

    Both A and R are true but R is not the correct explanation of A

  • Option D

    A is false but R is true

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  JEE Mains12 April 2023Shift 1Morning Shift

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• MCQmediumElectrostaticselectric dipole and dipole moment

  Two charges each of magnitude 0.01 C separated by 0.4 mm form a dipole. It is placed in a uniform electric field of 10 dyne C⁻¹ at 30°. The torque magnitude is:

  Options

  • Option A

    1.5 × 10⁻⁹ N m

  • Option B

    2.0 × 10⁻¹⁰ N m

  • Option C

    1.0 × 10⁻⁸ N m

  • Option D

    4.0 × 10⁻¹⁰ N m

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  JEE Mains13 April 2023Shift 1Morning Shift

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• IntegereasyElectrostaticselectric dipole and dipole moment

  An electric dipole of moment 6×10⁻⁶ C·m is initially parallel to a uniform electric field of 10⁶ N/C. Work required to rotate it through 180° is:

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  JEE Mains 2025 29 Jan Evening Shift

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• MCQmediumElectrostaticselectric dipole and dipole moment

  A rigid electric dipole performs small angular oscillations about its centre in a uniform electric field E₁ = E₀î. A second field E₂ = 2E₀(ĵ+k̂) is then added. Approximately what is the percentage increase in the oscillation frequency?

  Options

  • Option A

    73%

  • Option B

    63%

  • Option C

    83%

  • Option D

    53%

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  JEE Mains 2026 4 April Evening Shift

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• MCQmediumElectrostaticselectric dipole and dipole moment

  For an electric dipole, the electric field and potential at an axial point a distance r from its centre are E₀ and V₀. What are the electric field magnitude and potential at an equatorial point a distance 2r from the centre?

  Options

  • Option A

    E₀/16, 0

  • Option B

    E₀/4, 0

  • Option C

    E₀, V₀

  • Option D

    E₀/8, 0

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  JEE Mains 2025 22 Jan Evening Shift

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• MCQmediumElectrostaticselectric dipole and dipole moment

  A dipole of moment p is placed on the axis of a fixed point charge Q at distance r, with p parallel to the electric field. Assuming r is much larger than the dipole size, the magnitude of the net force on the dipole is:

  Options

  • Option A

    Qp/(4πε₀r³)

  • Option B

    2Qp/(4πε₀r³)

  • Option C

    3Qp/(4πε₀r³)

  • Option D

    0

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• MCQmediumElectrostaticselectric dipole and dipole moment

  Two small spherical balls, each of mass 10 g and carrying charges -2 μC and +2 μC, are attached to the ends of a very light rigid rod of length 20 cm. The rod is placed near an infinite non-conducting sheet having uniform surface charge density 100 μC/m², with the rod making an angle 30° with the electric field. Take ε₀ = 8.85×10⁻¹² C²/(N·m²). The magnitude of net torque on the rod is:

  Options

  • Option A

    11.2 N·m

  • Option B

    112 N·m

  • Option C

    2.24 N·m

  • Option D

    1.12 N·m

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  JEE Mains 2025 4 April Morning Shift

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• MCQeasyElectrostaticselectric dipole and dipole moment

  Three charges +2q, +3q and -4q are situated at (0, -3a), (2a, 0) and (-2a, 0) respectively in the xy plane. The resultant dipole moment about origin is___

  Options

  • Option A

    2qa(3ĵ - î)

  • Option B

    2qa(3î - 7ĵ)

  • Option C

    2qa(7î - 3ĵ)

  • Option D

    2qa(3ĵ - 7î)

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  JEE Mains 202624 January Morning Shift

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• NumericmediumElectrostaticselectric dipole and dipole moment

  The electric field at point p due to an electric dipole is E. The electric field at point R on equitorial line will be E/x. The value of x : Image

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  JEE Mains 2024 05 Apr Evening Shift

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