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JEE Main Magnetism — practice questions

Explore 18 free Magnetism questions in JEE Main Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Moving Charges and Magnetism: quick revision

A magnetic force is perpendicular to a moving charge’s velocity and the magnetic field. A uniform magnetic field alone changes the direction, not the speed, of a charged particle. Circular motion requires velocity perpendicular to the field.

Key ideas and when to use them

  • $F=|q|vB\sin\theta$.
  • Straight wire segment in uniform field: $F=BIL\sin\theta$.
  • Nonrelativistic circular orbit: $r=mv/(|q|B)$ for perpendicular motion.

Common mistakes

  • Use the angle between velocity and magnetic field.
  • Reverse the positive-charge force direction for a negative charge.

Three worked examples

Example 1: A +2 μC charge moves at 3000 m/s perpendicular to a 0.50 T field. Find the magnetic-force magnitude.
  1. Here $\sin90^\circ=1$.
  2. $F=(2\times10^{-6})\times3000\times0.50$.

0.003 N

Example 2: A straight 0.50 m wire carries 4 A perpendicular to a uniform 0.20 T field. Find its magnetic force.
  1. The entire stated segment is within the uniform field.
  2. $F=0.20\times4\times0.50$.

0.40 N

Example 3: A proton moves at 1.6 × 10⁶ m/s perpendicular to a 0.10 T field. Use m = 1.67 × 10⁻²⁷ kg and q = 1.6 × 10⁻¹⁹ C. Find its orbit radius.
  1. Equate magnetic force to the required centripetal force.
  2. $r=(1.67\times10^{-27})(1.6\times10^6)/[(1.6\times10^{-19})0.10]$.

0.167 m

Qallery AI-assisted study notes and original examples. Further reading: NCERT Physics — Moving Charges and Magnetism.

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Magnetism questions and exercises with answers

Showing questions 1–18 of 18.

The pattern of iron filings suggests that a bar magnet is a magnetic:Read the answer and worked solution →A freely suspended bar magnet comes to rest pointing in which direction?Read the answer and worked solution →Isolated magnetic north and south poles are known as magnetic:Read the answer and worked solution →Magnetic field lines of a magnet or a solenoid form what kind of loops?Read the answer and worked solution →Substances that get weakly magnetised in an external field are called:Read the answer and worked solution →Substances that get strongly magnetised in an external field are called:Read the answer and worked solution →Diamagnetic substances tend to move from the stronger part of a field to the:Read the answer and worked solution →Inside a diamagnetic material, the field lines are expelled and the field is:Read the answer and worked solution →Paramagnetic substances get weakly attracted towards which region of a field?Read the answer and worked solution →The dimensionless quantity relating magnetisation to magnetic intensity is the magnetic:Read the answer and worked solution →The quantity given by one plus the susceptibility is called the relative magnetic:Read the answer and worked solution →In a ferromagnetic material, atoms spontaneously align over a macroscopic volume called a:Read the answer and worked solution →The Earth behaves as a magnet with its field pointing approximately from geographic:Read the answer and worked solution →Why do magnetic field lines never intersect each other?Read the answer and worked solution →A larger number of field lines crossing per unit area means the field is:Read the answer and worked solution →What is the net magnetic flux through a closed surface around a magnet?Read the answer and worked solution →Which of these is listed as a diamagnetic material?Read the answer and worked solution →Which of these is listed as a paramagnetic material?Read the answer and worked solution →

Worked practice questions

The pattern of iron filings suggests that a bar magnet is a magnetic:

  1. Dipole
  2. Diploma
  3. Dilemma
  4. Display
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Correct answer: A. Dipole

1. Iron filings around a magnet trace out the field. 2. The shape they form matches a familiar electrical case. 3. The pattern suggests that the bar magnet is a magnetic dipole. 4. It has two poles like the two charges of an electric dipole. _Source: syllabus Physics Part I, Ch 5 'Magnetism and Matter'_

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A freely suspended bar magnet comes to rest pointing in which direction?

  1. North-north
  2. North-south
  3. North-east
  4. North-west
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Correct answer: B. North-south

1. The Earth itself behaves as a magnet. 2. A free magnet lines up with that field. 3. When a bar magnet is freely suspended, it points in the north-south direction. 4. So the answer is north-south. _Source: syllabus Physics Part I, Ch 5 'Magnetism and Matter'_

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Isolated magnetic north and south poles are known as magnetic:

  1. Monopoles
  2. Microphones
  3. Metronomes
  4. Megaphones
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Correct answer: A. Monopoles

1. Electric charges can be separated one from the other. 2. The magnetic case is different in that respect. 3. Isolated magnetic north and south poles are known as magnetic monopoles. 4. Unlike electric charges, they do not exist. _Source: syllabus Physics Part I, Ch 5 'Magnetism and Matter'_

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More Physics topics

Electric Charges and FieldsMechanical Properties of Solids and FluidsSemiconductor ElectronicsWave OpticsCurrent ElectricityUnit 2A: Newton's Laws and Translational EquilibriumMoving Charges and MagnetismAtoms and Nuclei