CBSE  /  Class 12  /  Physics  /  Magnetism and Matter

  • 1. 
    A current carrying power line carries current from west to east. What will be direction of magnetic field 1 meter above it?

  • N to S
  • S to N
  • E to W
  • W to E

  • 2. 
    The dimensional representation of \(\sqrt{l/MB}\) is similar to that of:

  • frequency
  • time
  • distance
  • speed

  • 3. 
    On quadrupling the moment of inertia of a magnet, its frequency of oscillation will become:

  • half
  • double
  • four times
  • one-fourth

  • 4. 
    The magnetic field strength due to a short bar magnet directed along its axial line at a distance r is B. What is its value at the same distance along the equatorial line?

  • B
  • 2B
  • \(\frac{B}{2}\)
  • \(\frac{B}{4}\)

  • 5. 
    The neutral point in the magnetic field of a horizontally placed bar magnet is a point where the magnetic field due to that bar magnet is:

  • zero
  • more than that of earth
  • less than that of earth
  • equal to that of earth

  • 6. 
    In a moving coil galvanometer, we use a radial magnetic field so that the galvanometer scale is :

  • exponential
  • linear
  • algebraic
  • logarithmic

  • 7. 
    The force between two parallel wire 2 × 10-7 Nm-1, placed 1 m apart to each other in vacuum. The electric current flowing through the wires is:

  • 1 A
  • zero
  • 5 × 106 A
  • 2 × 10-7 A

  • 8. 
    The force acting per unit length of a semi circular wire of radius R carrying a current I is:

  • \(\frac{µ_0l^2}{4R}\)
  • \(\frac{µ_0l^2}{2R}\)
  • \(\frac{µ_0l^2}{R}\)
  • \(\frac{2µ_0l^2}{R}\)

  • 9. 
    Which of the following has higher magnetic susceptibility?

  • diamagnetic
  • paramagnetic
  • ferromagnetic
  • None of these

  • 10. 
    The magnetic field of earth is due to:

  • induction effect of the sun
  • the presence of a large magnet at the centre of the earth
  • interaction of cosmic rays with the current of earth
  • motion and distribution of some material in an outside the earth
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