Free Electromagnetism MCQs with Answers
1,176 Electromagnetism MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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Read the Electromagnetism notesFree MDCAT chapter notes with key terms1,176 questions · page 25 of 59
- A. Decreased
- B. Increased
- C. Vanished
- D. Kept constant
Explanation: Faraday's Law says that the emf induced (and therefore the current induced) in the loop is proportional to the rate of change in magnetic…
Correct answer: Increased- A. Oscillation
- B. Half wave rectification
- C. Full wave rectification
- D. None of these
Explanation: The oscillation principle is applied in Cathode Ray Oscilloscopes (CROs) to generate and display electrical waveforms on a screen.
Correct answer: None of these- A. Perpendicular to the magnetic field
- B. Parallel to the magnetic field
- C. Far away from the magnetic field
- D. Inside a magnetic field
Explanation: The correct answer is that no force acts on a current-carrying conductor when it is parallel to the magnetic field.
Correct answer: Parallel to the magnetic field- A. Tesla
- B. henry
- C. Tesla/m
- D. Henry/m
Explanation: The SI unit of magnetic permeability is henries per meter (H/m) or newtons per ampere squared (N⋅A^−2).
Correct answer: Henry/m- A. yes directly we can see with eyes
- B. we need microscope
- C. we need telescope
- D. All cases are not possible
Explanation: This question tests electromagnetism, critical for medical students in physics (e.g., MRI applications).
Correct answer: All cases are not possible- A. Ampere's Law
- B. Faraday's Law
- C. Lenz's Law
- D. Both B and C
Explanation: Faraday's Law: This law states that an electromotive force (emf) is induced in a closed loop of wire when there is a change in the…
Correct answer: Both B and C- A. induced current
- B. induced potential
- C. motional emf
- D. all of these
Explanation: Lenz's law, in electromagnetism, states that an induced electric current flows in a direction such that the current opposes the change…
Correct answer: induced current- A. voltage in primary and secondary are equal
- B. current in primary and secondary are equal
- C. input power is same as the output power
- D. output power is zero
Explanation: If it is assumed that a transformer is 100% efficient then the power in the primary coil has to be equal to the power in the secondary…
Correct answer: input power is same as the output power- A. appliances
- B. machines
- C. motors
- D. load
Explanation: An electrical load is an electrical component or portion of a circuit that consumes (active) electric power, such as electrical appliances…
Correct answer: load- A. If it is moving parallel to the magnetic field.
- B. If it is moving antiparallel to the magnetic field.
- C. If the charge particle moves perpendicular to the magnetic field.
- D. Both A and B.
Explanation: The magnetic force on a moving charge is given by the equation F = qvB sin(θ), where θ is the angle between the velocity vector and the…
Correct answer: Both A and B.- A. 178.33 units/ cm2
- B. 1.87 units / cm2
- C. 192.77 units / cm2
- D. 200 units/ cm2
Explanation: Total flux = B x A and to get B, divide total flux/area hence B = 28/0.15 = 186.67 units.
Correct answer: 1.87 units / cm2- A. F= qv[E+B]
- B. qE[v+B]
- C. qvB
- D. q[E+vB]
Explanation: Lorentz force in electrical force is F = qE + qv x B Classifying this equation gives us F= q [ E+vB]
Correct answer: q[E+vB]- A. Coulomb's Law
- B. Ampere's Law
- C. Faraday's Law
- D. Lenz's Law
Explanation: A DC generator operates on the principle of electromagnetic induction i.e.
Correct answer: Faraday's Law- A. VsA^-2
- B. V^3sA^2
- C. V^2 s
- D. VsA^-1
Explanation: SI units for mutual inductance is Henry and 1 H = 1 V.s / A.
Correct answer: VsA^-1- A. 7 N
- B. 0 N
- C. 3.1 N
- D. 2.1 N
Explanation: When the conductor is placed parallel to magnetic field, no force will act on it.
Correct answer: 0 N- A. 1 N A-1 m
- B. 1 N-1 A-1 m
- C. 1 N-1 A-1 m-1
- D. 1 N A-1 m-1
Explanation: The correct answer is Option D: 1 N A-1 m-1. This is because the tesla is defined as the magnetic flux density that, when applied…
Correct answer: 1 N A-1 m-1- A. No emf produced in the secondary coil
- B. More emf in the secondary coil
- C. Equal emf produced in the secondary coil
- D. Less emf produced in the secondary coil
Explanation: A direct current will produce no varying magnetic field and therefore, no emf will be generated in the secondary coil.
Correct answer: No emf produced in the secondary coil- A. 2.88 x 10^-6 N/m
- B. 2.88 x 10^-4 N/m
- C. 2.88 x 10^-2 N/m
- D. 2.88 x 10^-8 N/m
Explanation: Force/Length = Magnetic Flux density x Current x sin(θ)For maximum force, sin(θ) = 1. Putting in the values gives us the answer.
Correct answer: 2.88 x 10^-4 N/m499. If a charge of 2C is moving with 5m/s enter at 30° in 3 T, calculate the force experienced by it.
- A. 10N
- B. 15N
- C. 20N
- D. 30N
Explanation: q x v x b x sin(θ)2 x 5 x 3 x sin(30)=15
Correct answer: 15N- A. Magnetic field
- B. Orientation
- C. Length
- D. All of these
Explanation: The factors on which 'Motional emf' depends are nothing but, the 'magnetic field, velocity, and length of the rod'.
Correct answer: All of these