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Physics - Magnetic Effects of Current

Practise 50 WBJEE previous year questions on Magnetic Effects of Current, compiled from papers spanning 2009 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.

Magnetic Effects of Current has been asked in 18 of the 18 years of WBJEE papers analysed (2009–2026), with 50 questions in all. 36% of them were easy, 50% moderate and 14% tough. Most of its questions came from 2022, with 5 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.

The chapter's 5 topics are not weighted equally: Motion of Charged Particle in Magnetic Field (16 questions, 32%), Force and Torque on Current Carrying Conductor (12 questions, 24%), and Magnetic Field (10 questions, 20%) have been asked the most. Motion of Charged Particle in Magnetic Field has also led over the last five years, with 5 questions. Motion of Charged Particle in Magnetic Field has produced the most tough questions (4).

  1. 1There is a ring of radius having linear charge density and rotating with a uniform angular velocity . The magnitude of the magnetic field pr2026Biot-Savart’s Law and Ampere’s Circuital Law
  2. 2A circular coil, carrying current, has radius . The distance from the centre of the coil on the axis where the magnetic induction will be th2026Biot-Savart’s Law and Ampere’s Circuital Law
  3. 3The magnetic moment of an iron bar is . It is now bent in such a way that it forms an arc section of a circle subtending an angle of at the 2026Magnetic Moment
  4. 4A particle of charge ' ' and mass ' ' moves in a circular orbit of radius ' ' with angular speed ' '. The ratio of the magnitude of its magn2025Magnetic Moment
  5. 5A charged particle moving with a volocity in a magnetic field experiences a force . Here all are constants. Then can be2024Motion of Charged Particle in Magnetic Field
  6. 6A wire carrying a steady current \(I\) is kept in the \(x\)-y plane along the curve \(y=A ( {2 }{ } x )\). A magnetic field \(B\) exists in 2023Biot-Savart's Law and Ampere's Circuital Law
  7. 7A charged particle in a uniform magnetic field \(B=B_0 {k}\) starts moving from the origin with velocity \(v=3 {i}+4 {k}\) m/s. The trajecto2023Motion of Charged Particle in Magnetic Field
  8. 8A charged particle of charge \(q\) and mass \(m\) is placed at a distance \(2 R\) from the centre of a vertical cylindrical region of radius2023Motion of Charged Particle in Magnetic Field
  9. 9A uniform magnetic field \(B\) exists in a region. An electron of charge \(q\) and mass \(m\) moving with velocity \(v\) enters the region i2023Motion of Charged Particle in Magnetic Field
  10. 10Two infinite line-charges parallel to each other are moving with a constant velocity in the same direction as shown in the figure. The separ2022Magnetic Field
  11. 11An electron revolves around the nucleus in a circular path with angular momentum uniform magnetic field is applied perpendicular to the plan2022Motion of Charged Particle in Magnetic Field
  12. 12A straight wire is placed in a magnetic field that varies with distance from origin as . Ends of wire are at and and it carries a current . 2022Force and Torque on Current Carrying Conductor
  13. 13A horizontal semi-circular wire of radius is connected to a battery through two similar springs and to an electric cell, which sends current2022Force and Torque on Current Carrying Conductor
  14. 14As shown in figure, a rectangular loop of length ' a' and width ' ' and made of a conducting material of uniform crosssection is kept in a h2022Force and Torque on Current Carrying Conductor
  15. 15Consider two infinitely long wires parallel to Z-axis carrying same current I in the positive Z direction. One wire passes through the point2021Magnetic Field
  16. 16A thin charged rod is bent into the shape of a small circle of radius the charge per unit length of the rod being . The circle is rotated ab2021Magnetic Field
  17. 17A particle of mass and charge moving with velocity enters region-b form region-a along the normal to the boundary as shown is the figure. Re2021Motion of Charged Particle in Magnetic Field
  18. 18As shown in the figure, a single conducting wire is bent to form a loop in the form of a circle of radius 'r' concentrically inside a square2020Magnetic Field
  19. 19As shown in the figure, a wire is bent to form a D-shaped loop, carrying current I, where the curved part is semi-circle of radius . the loo2020Force and Torque on Current Carrying Conductor
  20. 20A conducting circular loop of resistance and cross-sectional area is placed perpendicular to a spatially uniform magnetic field B, which var2020Magnetic Field
  21. 21To which of the following quantities, the radius of the circular path of a charged particle moving at right angles to a uniform magnetic fie2019Motion of Charged Particle in Magnetic Field
  22. 22An electric current enters and leaves a uniform circular wire of radius through diametrically opposite points. A particle carrying a charge 2019Force and Torque on Current Carrying Conductor
  23. 23A current ' is flowing along an infinite, straight wire, in the positive -direction and the same current is flowing along a similar parallel2019Magnetic Field
  24. 24A square conducting loop is placed near an infinitely long current carrying wire with one edge parallel to the wire as shown in the figure. 2019Biot-Savart's Law and Ampere's Circuital Law
  25. 25A particle with charge moves with a velocity in a direction perpendicular to the directions of uniform clectric and magnetic ficlds, and res2019Motion of Charged Particle in Magnetic Field
  26. 26A proton of mass moving with a speed ( c. velocity of light in vacuum) completes circular orbit in time in a uniform Whetic ficld. If the sp2018Motion of Charged Particle in Magnetic Field
  27. 27A uniform current is flowing along the length dinfinite, straight. thin. hollow cylinder dradius The magnetic field produced at perpendicula2018Biot-Savart's Law and Ampere's Circuital Law
  28. 28A circular loop of radius of conducting wire connected with a voltage source of zero internal resistance produces a magnetic field at its ce2018Biot-Savart's Law and Ampere's Circuital Law
  29. 29The magnetic field due to a current in a straight wire segment of length at a point on its perpendicular bisector at a distano2017Biot-Savart's Law and Ampere's Circuital Law
  30. 30A proton is moving with a uniform velocity of along the -axis, under the joint action of a magnetic field along -axis and an electric field 2017Motion of Charged Particle in Magnetic Field
  31. 31Two long parallel wires separated by carry currents of 1 A and 2 A, respectively in opposite directions. A third current-carrying wire paral2017Force and Torque on Current Carrying Conductor
  32. 32An electron enters an electric field having intensity and magnetic field having induction T with a velocity ms . The magnitude of the force 2016Motion of Charged Particle in Magnetic Field
  33. 33A charged particle of mass and charge is revolving in a circle of radius Another charged particle of charge and mass is situated at the cent2016Motion of Charged Particle in Magnetic Field
  34. 34A rectangular coil carrying-current is placed in a non-uniform magnetic field. On that coil, the total2016Force and Torque on Current Carrying Conductor
  35. 35Two particles, and , having equal charges, after being accelerated through the same potential difference enter into a region of uniform magn2015Motion of Charged Particle in Magnetic Field
  36. 36A straight conductor long moves in uniform magnetic field . The velocity the conductor is and is directer perpendicular to the field. The em2015Force and Torque on Current Carrying Conductor
  37. 37An electron in a circular orbit of radius performs revolutions per second. The maghetic moment due to this rotation of electron is (in )2014Magnetic Moment
  38. 38A proton of mass and charge is moving in a plane with kinetic energy . If there exists a uniform magnetic field , perpendicular to the plane2014Motion of Charged Particle in Magnetic Field
  39. 39A long conducting wire carrying a current is bent at (see figure). The magnetic field at a point on the right bisector of bending angle at a2014Biot-Savart's Law and Ampere's Circuital Law
  40. 40A stream of electrons and protons are directed towards a narrow slit in a screen (see figure). The intervening region has a uniform electric2014Motion of Charged Particle in Magnetic Field
  41. 41A current of 1 A is flowing along positive -axis through a straight wire of length placed in a region of a magnetic field given by The magni2013Force and Torque on Current Carrying Conductor
  42. 42An equilateral triangle is made by uniform wires A current enters at and leaves from the mid point of . If the lengths of each side of the t2013Magnetic Field
  43. 43A bar magnet has a magnetic moment of . The magnet is suspended in a magnetic field of . The torque required to rotate the magnet from its e2013Force and Torque on Current Carrying Conductor
  44. 44If and are the magnitudes of electric and magnetic fields respectively in some region of space, then the possibilities for which a charged p2013Motion of Charged Particle in Magnetic Field
  45. 45A straight wire of length carries a current of . If this wire is placed in a uniform magnetic field of 0.15 T making an angle of with the ma2012Force and Torque on Current Carrying Conductor
  46. 46A magnetic needle is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of and the work2012Force and Torque on Current Carrying Conductor
  47. 47Current through \( {ABC}\) and \( {A}^{ } {B}^{ } {C}^{ }\) is \( {I}\). What is the magnetic field at \( {P}\) ? \( {BP}= {PB}^{ }= {r} ( .2011Magnetic Field
  48. 48The magnetic field at the point of intersection of diagonals of a square wire loop of side \( {L}\) carrying a current \( {I}\) is2011Magnetic Field
  49. 49The ratio of magnetic field and magnetic moment at the centre of a current carrying circular loop is . When both the current and radius is d2010Magnetic Field
  50. 50Which of the following relation represent Biot-Savart's law?2009Biot-Savart's Law and Ampere's Circuital Law

Frequently Asked Questions

1.How many questions are available for Magnetic Effects of Current?

This chapter includes 50 questions compiled from WBJEE papers spanning 2009 to 2026.

2.Are these questions only from WBJEE, or from other exams too?

These are WBJEE questions specifically for the Magnetic Effects of Current chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Magnetic Effects of Current an important chapter for WBJEE Physics?

Magnetic Effects of Current has appeared in 18 of the 18 years of WBJEE papers covered here, with 50 questions across 18 papers - about 3 per paper it appears in.

4.What is the difficulty level of Magnetic Effects of Current questions in WBJEE?

Of the 50 questions analysed for this chapter, 36% are easy, 50% moderate and 14% tough. 2022 had the most, with 5 questions.

5.Which topics in Magnetic Effects of Current should I focus on?

These topics have carried the most weightage in Magnetic Effects of Current:

  • Motion of Charged Particle in Magnetic Field - 16 questions (32%)
  • Force and Torque on Current Carrying Conductor - 12 questions (24%)
  • Magnetic Field - 10 questions (20%)
  • Motion of Charged Particle in Magnetic Field has produced the most tough questions (4).
6.Is Magnetic Effects of Current's weightage in WBJEE going up or down?

Across all 18 papers analysed, Magnetic Effects of Current has averaged about 2.8 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.