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Federal (FBISE) · Chapter test · Free

1st Year Physics Chapter 12 Test12. Magnetism

30 marks · 40 minutes · 21 questions. Covers: 12. Magnetism.

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1st Year Physics Chapter 12 Test

1st Year · Physics · Federal (FBISE)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. The magnetic field around a long straight current-carrying conductor is in the form of:
    1. Straight lines
    2. Concentric circles
    3. Parabolic curves
    4. Random loops
  2. The combined electric and magnetic force acting on a charged particle is called:
    1. Fleming force
    2. Coulomb force
    3. Lorentz force
    4. Maxwell force
  3. When the angle between velocity and magnetic field is neither 0°, 90°, nor 180°, the particle moves in a:
    1. Circular path
    2. Straight path
    3. Helical path
    4. Zig-zag path
  4. Which of the following particle in motion cannot be deflected by magnetic field?
    1. Electron
    2. Proton
    3. Alpha-particle
    4. Neutron
  5. A charged particle moves in a circular path when:
    1. v ⟂ B
    2. v ∥ B
    3. v ∝ B
    4. v = 0
  6. The formula for magnetic force on a conductor in a magnetic field is:
    1. F = IBL
    2. F = BIL sinθ
    3. F = BI/L
    4. F = L/B
  7. Magnetic force between two magnets occurs due to:
    1. Contact force
    2. Their magnetic fields interacting
    3. Weight of magnets
    4. Pressure
  8. Magnetic force acts on a charged particle only if:
    1. The charge is very large
    2. The charge is moving
    3. The charge is stationary
    4. Magnetic field is zero
  9. Magnetic flux will be maximum when:
    1. Magnetic field is perpendicular to the plane area
    2. Magnetic field lies parallel to the plane area
    3. Area is held at an angle of 45°
    4. Area is held at an angle of 60°
  10. Magnetic force on a current-carrying conductor is proportional to:
    1. Current only
    2. Magnetic field only
    3. Length of conductor only
    4. All of these

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. When do two current-carrying wires attract each other?
  2. What does a curremt carrying conductor may experience force in magnetic field?
  3. When is magnetic flux maximum?
  4. Write the formula for magnetic force on a current-carrying conductor.
  5. Why is the magnetic field between two wires weaker when currents are in the same direction?
  6. How is Faraday's law applied in a seismometer?
  7. Why is magnetic force zero when a particle moves parallel to the magnetic field?
  8. Why is the force between two wires an action-reaction pair?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. A particle carrying a charge of 1μC and moving with velocity of 2 x 10⁶ m/s enters in a magnetic field of 0.5 T at angle of 60º with the field. Calculate the magnitude of magnetic force acting on it.
  2. Find the magnetic force acting on a charged particle of charge 2 μC in a magnetic field of 2 T acting in y-direction when particle velocity is (2î +3j^) x 10⁶ ms⁻¹.
  3. A coil of wire has 100 loops. Each loop has an area of 2.0 x 10⁻³ m². A magnetic field is perpendicular to the surface of each loop at all times. If the magnetic field is changed from 0.2 T to 0.6 T in 0.1 s, find the average emf induced in the coil during this time.