Magnetic effect of current questions with solutions

Showing 1–10 of 488 questions

• MCQmediumMagnetic effect of currentMotion of Charged Particles in a Magnetic Field

  A positive particle starts at the origin with velocity uî+wk̂ in uniform parallel fields B=Bk̂ and E=Ek̂. With ω=qB/m, which z-coordinate is correct at time t?

  Options

  • Option A

    wt+qEt²/(2m)

  • Option B

    wt-qEt²/(2m)

  • Option C

    (w/ω)sinωt

  • Option D

    qEt/m

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• MCQmediumMagnetic effect of current

  

  A square current-carrying loop ABCD of side 10 cm carries current i=10 A as shown. The magnetic moment vector M⃗ of the loop is:

  Options

  • Option A

    0.05(î-√3k̂) A·m²

  • Option B

    0.05(ĵ+k̂) A·m²

  • Option C

    0.05(ĵ+k̂) A·m²

  • Option D

    (î+k̂) A·m²

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• NumericmediumMagnetic effect of current

  An equilateral triangular loop of side ℓ carries current i. If the magnetic field at its circumcentre is written B=μ₀αi/(4πℓ), find α.

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• MCQmediumMagnetic effect of currentMagnetic Dipole Moment, Torque and Equilibrium of Current-Carrying Loops

  A uniform conducting wire of length 12a and resistance R is wound into (i) an equilateral triangle with side a and (ii) a square with side a. The magnetic dipole moments of the two coils carrying the same current I are respectively:

  Options

  • Option A

    √3 Ia² and 3Ia²

  • Option B

    3Ia² and Ia²

  • Option C

    3Ia² and 4Ia²

  • Option D

    4Ia² and 3Ia²

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  NEET 2021NEET Previous Year

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• MCQmediumMagnetic effect of currentAmpere's Circuital Law and Its Applications

  Two infinitely long current-carrying wires lie perpendicular to one another, as shown. Lines AB and CD are perpendicular and symmetrically situated with respect to the currents. At which positions does the resultant magnetic field vanish? [Image]

  Options

  • Option A

    On AB

  • Option B

    On CD

  • Option C

    On both AB and CD

  • Option D

    On both OD and BO

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  AIPMT 1996NEET Previous Year

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• Multi-correctmediumMagnetic effect of currentMotion of Charged Particles in a Magnetic Field

  Two particles of equal mass, equal speed and equal |q| but opposite charge signs enter normally at the same point into the same uniform magnetic strip. Which statements are correct?

  Select all that apply

  • Option A

    Their path radii are equal.

  • Option B

    For the same strip width their residence times are equal.

  • Option C

    They bend to opposite sides.

  • Option D

    Their exit points are mirror images about the initial direction when both reach the far boundary.

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• MCQeasyMagnetic effect of currentMagnetic Dipole Moment, Torque and Equilibrium of Current-Carrying Loops

  A current-carrying coil is placed in a uniform magnetic field. In stable equilibrium, how will the plane of the coil orient relative to the field?

  Options

  • Option A

    At 45° to the magnetic field

  • Option B

    At any arbitrary angle to the field

  • Option C

    Parallel to the magnetic field

  • Option D

    Perpendicular to the magnetic field

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  AIPMT 1988NEET Previous Year

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• Multi-correctmediumMagnetic effect of current

  Two infinitely long straight wires lie in the xy-plane along the lines x = ±R. The wire located at x = +R carries a constant current I₁ and the wire located at x = -R carries a constant current I₂. A circular loop of radius R is suspended with its centre at (0, 0, 3R ) and in a plane parallel to the xy-plane. This loop carries a constant current I in the clockwise direction as seen from above the loop. The current in the wire is taken to be positive if it is in the +ĵ direction. Which of the following statements regarding the magnetic field B⃗ is (are) true ?

  Select all that apply

  • Option A

    If I₁=I₂, B⃗ cannot be zero at the origin.

  • Option B

    If I₁>0 and I₂<0, B⃗ can be zero at the origin.

  • Option C

    If I₁<0 and I₂>0, B⃗ can be zero at the origin.

  • Option D

    If I₁=I₂, the z-component at the loop centre is -μ₀I/(2R).

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  JEE Advanced 2018

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• NumericmediumMagnetic effect of currentMagnetic Field Produced by Moving Charges

  A hollow, right circular cone of base radius R and height h, with its tip at the origin is rotating about the Z-axis with an angular velocity ω, as shown in the figure. The cone carries a total charge Q uniformly distributed on its curved surface. The magnitude of magnetic field at a point (0,0,z), where z ≫ R and z ≫ h, is n μ₀QR²ω/(4πz³). The value of n is:

  

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  JEE Advanced2026Paper 1

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• MCQmediumMagnetic effect of current

  A semi circular current carrying wire having radius R is placed in x-y plane with its centre at origin ‘O’. There is non-uniform magnetic field B⃗ = B𝑜x 2𝑅k̂ (here Bo is +ve constant) is existing in the region. The magnetic force acting on semi circular wire will be along :-

  

  Options

  • Option A

    - x-axis

  • Option B

    + y-axis

  • Option C

    - y-axis

  • Option D

    + x-axis

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