Free Electromagnetic Induction MCQs with Answers
288 Electromagnetic Induction MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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Read the Electromagnetic Induction notesFree MDCAT chapter notes with key terms288 questions · page 4 of 15
- A. Alternating current
- B. Direct current
- C. Induced current
- D. None of these
Explanation: The Explanation of this question will be added soon!
Correct answer: Induced current- A. Moves across the magnetic field
- B. Is kept in the magnetic field
- C. Is kept in an electric field
- D. None of these
Explanation: The Explanation of this question will be added soon!
Correct answer: Moves across the magnetic field- A. Magnetic induction
- B. Electromagnetic induction
- C. Both (a) and (b)
- D. None of these
Explanation: This option correctly identifies the phenomenon as "electromagnetic induction," which refers to the process by which a changing magnetic…
Correct answer: Electromagnetic induction- A. 1830
- B. 1841
- C. 1831
- D. 1931
Explanation: Faraday's law of electromagnetic induction was deduced in the year 1831.
Correct answer: 1831- A. 1834
- B. 1934
- C. 1826
- D. 1836
Explanation: Lenz's law was presented in the year 1834. It was formulated by the Russian physicist Heinrich Friedrich Emil Lenz in 1834.
Correct answer: 1834- A. Japan
- B. China
- C. Russian
- D. None of above
Explanation: Lenz was a Russian physicist. He was born in Dorpat, then part of the Russian Empire (now Tartu, Estonia), in 1804.
Correct answer: Russian- A. A rheostat and battery
- B. A rheostat and galvanometer
- C. Galvanometer only
- D. None of these
Explanation: When studying the phenomenon of mutual induction between two coils, the primary coil typically consists of: A rheostat and battery.The…
Correct answer: A rheostat and battery- A. A rheostat and battery
- B. A battery only
- C. A galvanometer only
- D. A rheostat only
Explanation: In a typical setup studying mutual induction between two coils, the secondary coil circuit usually consists of: A galvanometer only.
Correct answer: A galvanometer only- A. Rate of change of magnetic flux
- B. Rate change of electric flux
- C. Change of magnetic flux
- D. All of above
Explanation: The electromotive force (EMF) induced in the secondary coil of a transformer is directly proportional to the rate of change of magnetic…
Correct answer: Rate of change of magnetic flux- A. Opposite to that of battery
- B. In the same direction at that of battery
- C. Both (a) and(b)
- D. None of these
Explanation: When the current in the coil itself is increased by a rheostat, it means the rate of change of current is also increasing.
Correct answer: Opposite to that of battery- A. Resistors in D.C circuit
- B. Resistors in A.C circuit
- C. Both (a) and (b)
- D. None of these
Explanation: In an AC circuit, the behavior of an inductor is often compared to that of a resistor.
Correct answer: Resistors in A.C circuit- A. Insulator
- B. Semi-conductor
- C. Inductor
- D. All of above
Explanation: The correct term for a coil of wire is Inductor.An inductor, often referred to simply as a coil, is a passive electronic component that…
Correct answer: Inductor- A. Magnetic field of an inductor
- B. Electric field of the capacitor
- C. Magnetic field of the capacitor
- D. Both (a) and (b)
Explanation: When a current flows through an inductor, it generates a magnetic field around it according to Ampere's law.
Correct answer: Magnetic field of an inductor- A. Energy density inside the coil
- B. Energy stored in a conductor
- C. Energy stored in an inductor
- D. All of above
Explanation: The symbol "U" typically represents energy in physics, and when subscripted with "m" (Um), it commonly denotes magnetic energy.
Correct answer: Energy stored in an inductor- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: None of the options provided seem to accurately represent a comprehensive formula for calculating the self-inductance of an iron-cored…
Correct answer: Option D- A. Energy density
- B. Power density
- C. Energy
- D. Surface charge density
Explanation: Energy stored per unit volume inside a long solenoid is known as Energy density.The energy density inside a long solenoid, often denoted…
Correct answer: Energy density77. The phenomenon in which a change of current in one coil induces an emf in the other coil is called:
- A. Self induction
- B. Mutual induction
- C. Electric induction
- D. None of above
Explanation: Mutual induction occurs when a changing current in one coil induces a voltage in another nearby coil.
Correct answer: Mutual induction- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Mathematically, mutual inductance (M) between two coils can be defined as: M=N2 Φ21/I1 ORM=N1Φ12/I2Where:M is the mutual inductance (in…
Correct answer: Option A- A. Farad
- B. Coulomb
- C. Henry
- D. Ampere
Explanation: The SI unit of mutual inductance is the Henry (H). It is derived from the equation relating induced voltage (V), rate of change of current…
Correct answer: Henry- A. Flux density
- B. emf
- C. Magnetic flux
- D. Both (a) and (b)
Explanation: The correct answer is: Both (a) and (b) are scalar.Here's a breakdown of each quantity and why they are scalar:Flux density: In both…
Correct answer: Both (a) and (b)