CBSE  /  Class 12  /  Physics  /  Moving Charges and Magnetism

  • 1. 
    According to Ampere's Circuital law
    MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism with Answers

  • a
  • b
  • c
  • d

  • 2. 
    Two identical bar magnets each of dipole moment p and length I are perpendicular to each other as shown in Fig. The dipole moment of the combination is:
    MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism with Answers

  • √2 p
  • \(\frac{p}{√2}\)
  • P
  • 2p

  • 3. 
    The current sensitibility of a moving coil galanometer increases with decrease in:

  • magnetic field
  • area of a coil
  • number of turns
  • None of these

  • 4. 
    A current carring coil is placed in a uniform magnetic field. If the coil turns through an angle θ, then the torque is directly proportional to:

  • sin θ
  • cos θ
  • cot θ
  • tan θ

  • 5. 
    The sensitivity of a tangent galvanometer can be increased by increasing:

  • the radius of the coil
  • the external magnetic field
  • the number of turns of the coil
  • all the above

  • 6. 
    The permeability of a paramagnetic substance is:

  • very large
  • small but more than unity
  • less than unity
  • negative

  • 7. 
    Which of the following shows that the earth behaves as a magnet?

  • Repulsion between like poles .
  • Attraction between unlike poles
  • Null points in the magnetic field of a bar magnet
  • No existence of isolated magnetic poles

  • 8. 
    What is the angle of dip at the magnetic poles?

  • 30°
  • 0°
  • 45°
  • None of these

  • 9. 
    A charged particle of mass m and charge q travels on a circular path of radius r i.e., perpendicular to the magnetic field B. The time taken by particle to complete on revolution is :

  • \(\frac{2πqB}{m}\)
  • \(\frac{2πm}{qB}\)
  • \(\frac{2πmq}{B}\)
  • \(\frac{2πq^2B}{m}\)

  • 10. 
    Circular loop of radius 0.0157 m carries a current 2 A. The magnetic field at the centre of the loop is :

  • 1.57 × 10-3Wb/m²
  • 8.0 × 10-5 Wb/m²
  • 2.0 × 10-3 Wb/m²
  • 3.l4 × 10-1 Wb/m²
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