# MCQs in Electricity and Magnetism Fundamentals Part I

(Last Updated On: December 8, 2017)

This is the Multiples Choice Questions Part 1 of the Series in Electricity and Magnetism Fundamentals as one of the Electronics Engineering topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Exam Questions in Electronics Engineering field, Electronics Books, Journals and other Electronics References.

### Multiple Choice Questions Topic Outline

• MCQs in Atomic Structure
• MCQs in Electric Charge
• MCQs in Ohm’s Law, Kirchoff Law, Coulomb’s Law, etc
• MCQs in Magnetic Power
• MCQs in Magnetic Field and Magnetic Flux
• MCQs in Magnetic and Electric Quantities / Units
• MCQs in Magnetic/Electromagnet Principles

### The Series

Following is the list of multiple choice questions in this brand new series:
Electricity and Magnetism Fundamentals MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI

1. What is the diameter of an atom?

2. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages. This is known as

• A. Joule’s Law
• B. Faraday’s second law of electromagnetic induction
• C. Faraday’s first law of electromagnetic induction
• D. Coulomb’s Law

3. The force of attraction or repulsion between two magnetic poles is inversely proportional to the square of the distance between them. This is known as

• A. Newton’s first law
• B. Faraday’s first law of electromagnetic induction
• C. Coulomb’s first law
• D. Coulomb’s second law

4. The net electrical charge in an isolated system remains constant. This is known as

• A. Law of conservation of charge
• B. Coulomb’s first law
• C. Coulomb’s second law
• D. Law of conservation of energy

5. The point in a magnet where the intensity of magnetic lines of force is maximum

• A. Magnetic pole
• B. South pole
• C. North pole
• D. Unit pole

6. The emf induced in a coil due to the change of its own flux linked with it is called

• A. Mutually induced emf
• B. Dynamically induced emf
• C. Statically induced emf
• D. Self induced emf

7. If the solenoid is gripped by the right hand with the fingers pointing the direction of current flow, the outstretched thumb will then point the north pole. This is known as

• A. Right hand rule
• B. Helix rule
• C. End rule
• D. Cork screw rule

8. The phenomenon by which a subtracts pieces of iron

• A. Magnetism
• B. Electromagnetism
• C. Naturalism
• D. Materialism

9. A law that states that the current in a thermionic diode varies directly with the three-halves power of anode voltage and inversely with the square of the distance between the electrodes, provided operating conditions are such that the current is limited only by the space charge.

• A. Hall’s law
• B. Joule’s law
• C. Child’s law
• D. Coulomb’s law

10. Who developed the electromagnetic theory of light in 1862?

• A. Heinrich Rudolf Hertz
• B. Wilhelm Rontgen
• C. James Clerk Maxwell
• D. Andre Ampere

11. The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called

• A. Magnetic field
• B. Electric field
• C. Electromagnetic field
• D. Free Space Field

12. States that the ratio of the thermal conductivity is proportional to the absolute temperature for all metals.

• A. Wien’s displacement law
• B. Hartleys law
• C. Hall’s law
• D. Wiedemann Franz law

13. Materials whose permeabilities are slightly greater than that of free space

• A. Paramagnetic
• B. Non- magnetic
• C. Ferromagnetic
• D. Diamagnetic

14. Who discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?

• A. Luigi Galvani
• B. Hans Christian Oersted
• C. Andre Ampere
• Charles Coulomb

15. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)

• A. Paramagnetic
• B. Non- magnetic
• C. Ferromagnetic
• D. Diamagnetic

16. If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as

• A. Right hand rule
• B. Left hand rule
• C. Cork screw rule
• D. End Rule

17. The straight line passing through the two poles of magnet is called

• A. Real axis
• B. Cartesian axis
• C. Magnetic axis
• D. Imaginary axis

18. Who discovered the most important electrical effects which is the magnetic effect?

• A. Hans Christian Oersted
• B. Sir Charles Wheatstone
• C. Georg Ohm
• D. James Clerk Maxwell

19. Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons

• A. North pole
• B. South pole
• C. Unit pole
• D. Magnetic pole

20. Referred to as the specific reluctance of a material

• A. Resistivity
• B. Reluctivity
• C. Conductivity
• D. Permeability

21. Which of the following magnetic materials can be easily magnetized in both direction?

• A. Soft magnetic materials
• B. Hard magnetic materials
• C. High hysteresis loss materials
• D. Low hysteresis loss materials

22. The force which set ups or tends to set up magnetic flux in a magnetic circuit

• A. Dynamic force
• B. Electromotive force
• C. Potential difference
• D. Magnetomotive force

23. A law establishing the fact that the algebraic sum of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.

• A. Kirchhoff’s circuital law
• B. Maxwell’s circuital law
• C. Ampere’s circuital law
• D. Coulomb’s circuital law

24. The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet

• A. Magnetic effect
• B. Magnetic phenomenon
• C. Magnetic induction
• D. Electromagnetic induction

25. The magnetic potential in a magnetic circuit can be measured in terms of

• A. Mmf
• B. Emf
• D. Coulomb

26. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

• A. Luigi Galvani
• B. Hans Christian Oersted
• C. Charles Coulomb
• D. Andre Ampere

27. Lenz’ law states that the direction of the induced emf and hence current

• A. Is determined by the rate of current flux
• B. Is found by the right hand rule
• C. Is found by the left hand rule
• D. Always opposes the cause producing it

28. Whenever a flux inking a coil or current changes, an emf is induced in it. This is known as

• A. Joule’s Law
• B. Coulomb’s Law
• C. Faraday’s first law of electromagnetic induction
• D. Faraday’s second law of electromagnetic induction

29. Which of the following materials has permeability slightly less than that of free space?

• A. Paramagnetic
• B. Non- magnetic
• C. Ferromagnetic
• D. Diamagnetic

30. The property of a material which opposes the creation of magnetic flux in it

• A. Resistance
• B. Reluctance
• C. Permeance
• D. Conductance

31. Who discovered superconductivity in 1911?

• A. Kamerlingh Onnes
• B. Alex Muller
• C. Geory Bednorz
• D. Charles Coulomb

32. A substance that attracts pieces iron

• A. Conductor
• B. Semiconductor
• C. Magnet
• D. All of the above

33. The point in a magnet where the intensity of magnetic lines of force is maximum

• A. Magnetic pole
• B. South pole
• C. North pole
• D. Unit pole

34. Lenz’s law is the consequence of the law of conservation of

• A. Energy
• B. Charge
• C. Field lines
• D. Momentum

35. Defined as a closed path in which magnetic induction or flux flows

• A. Electric circuit
• B. Magnetic circuit
• C. Electronic circuit
• D. Electromagnetic circuit

36. Who demonstrated the theory of electromagnetic induction in 1831?

• B. Andre Ampere
• C. James Clerk Maxwell
• Charles Coulomb

37. Who discovered that a current-carrying conductor would move when placed in a magnetic field?

• B. Andre Ampere
• C. Hans Christian Oersted
• D. Gustav Robert Kirchhoff

38. Whenever a conductor cuts magnetic flux, an emf is induced in it. This is known as

• A. Coulomb’s law
• B. Joule’s law
• D. Ohm’s law

39. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.

• A. Joule’s law
• C. Coulomb’s law
• D. Lenz’ law

40. If you hold the conductor with right hand so that the stretched thumb points in the direction of the current, then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as

• A. Left hand cork screw rule
• B. Right hand cork screw rule
• C. Left hand rule
• D. Right hand rule

41. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as

• A. Right hand rule
• B. Left hand rule
• C. Cork screw rule
• D. End rule

42. The process by which an emf and hence current is generated or induced in a conductor when there is a change in the magnetic flux linking the conductor is called

• A. Electromagnetic induction
• B. Mutual induction
• D. Electromagnetic interference

43. The emf induced in a coil due to the changing current of another neighboring coil is called

• A. Mutually induced emf
• B. Self induced emf
• C. Statically induced emf
• D. Dynamically induced emf

44. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called

• A. Statically induced emf
• B. Mutually induced emf
• C. Self induced emf
• D. Dynamically induced emf

45. Which of the following is a natural magnet?

• A. Steel
• B. Magnesia
• C. Lodestone
• D. Soft iron

46. The branch of Engineering which deals with the magnetic effect of electric current is known as

• A. Magnetism
• B. Electromagnetism
• C. Electrical engineering
• D. Electronics engineering

47. The total number of magnetic lines of force in a magnetic field is called

• A. Magnetic flux
• B. Magnetic flux density
• C. Magnetic flux intensity
• D. Magnetic potential

48. The current of electric circuit is analogous to which quantity of a magnetic circuit

• A. Mmf
• B. Flux
• C. Flux density
• D. Reluctivity

49. It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.

• A. Resistance
• B. Conductance
• C. Permeance
• D. Inductance

50. The ability of a material to conduct magnetic flux through it.

• A. Permittivity
• B. Reluctivity
• C. Conductivity
• D. Permeability

### Complete List of MCQs in Electronics Engineering per topic

MCQs in Electricity and Magnetism Fundamentals Part I
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