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Electromagnetism MCQs for MDCAT Practice

Physics section, Electromagnetism chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 1,004 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    The direction of the magnetic line of force depends upon:
    • Nature of the material of the conducting wire
    • Area of the conducting wire
    • Amount of the current
    • Direction of the current (correct answer)
    Correct answer: D
    The direction of magnetic field lines around a current-carrying wire is determined solely by the direction of the current, not material properties, area, or magnitude.
  2. Question 2
    The magnetic flux will be maximum, for an angle of:
    • 0o (correct answer)
    • 90o
    • 60o
    • 180o
    Correct answer: A
    Understand how the angle between a magnetic field and a surface affects magnetic flux, a key concept in electromagnetic induction.
  3. Question 3
    What is the formula for magnetic flux?
    • BA cos(θ) (correct answer)
    • BA
    • B
    • BA sin(θ)
    Correct answer: A
    Magnetic flux quantifies the magnetic field lines passing through a surface, determined by field strength, area, and orientation.
  4. Question 4
    A 20.0 cm wire carrying a current of 10.0 A is placed in a uniform magnetic field of 3.0 T. If the wire makes an angle of 40^(o) with the direction of the magnetic field. Find the (approx) magnitude of the force acting on the wire? (Sin 40^(o) = 0.642)
    • 2.71 N
    • 6.61 N
    • 7.61 N
    • 0.39 N (correct answer)
    Correct answer: D
    Calculate the magnetic force on a current-carrying wire using F = ILBsin(theta), ensuring correct unit conversions and trigonometric application.
  5. Question 5
    Which one of the following particles moving in the magnetic field cannot be deflected:
    • α-particle
    • Electron
    • β-particle
    • Neutron (correct answer)
    Correct answer: D
    Charged particles experience magnetic force, but neutral particles do not, explaining why neutrons are undeflected in a magnetic field.
  6. Question 6
    When a charged particle is project perpendicular to a uniform magnetic field, the radius of the circulating path it traverses is proportional to:
    • 1/(mass of particle)
    • 1/(charge of particle)
    • 1/(applied magnetic field)
    • both "B" and "C" (correct answer)
    Correct answer: D
    The radius of a charged particle's circular path in a magnetic field is inversely proportional to charge and magnetic field strength, but directly proportional to momentum.
  7. Question 7
    The normal to a certain 1m2 area makes an angle of 60o with a uniform magnetic field. The magnetic flux through this area is the same as the flux through a second area that is perpendicular to the field if the second area is:
    • 0.866 m2
    • 1.15 m2
    • 0.5 m2 (correct answer)
    • 2 m2
    Correct answer: C
    This question tests understanding of magnetic flux, specifically how it depends on area and orientation relative to the magnetic field.
  8. Question 8
    A magnetic field cannot :-
    • Exert a force on charged particle
    • Change the velocity of charged particle
    • Change the momentum of charged particle
    • Change the kinetic energy of charged particle (correct answer)
    Correct answer: D
    A magnetic field exerts a force perpendicular to velocity, thus it can change direction but not speed or kinetic energy of a charged particle.

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Read the full Electromagnetism chapter notes: Electromagnetism notes. Or browse every chapter.