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mcq on Magnetic Effects of Electric Current with Answers for NEET Students
Who first identified the phenomenon of Eddy currents in 1851, which circulate in closed loops inside conductors perpendicular to a magnetic field?
a) David Hughes
b) Charles Townes
c) Nicola Tesla
d) Leon Foucault
Option d – Leon Foucault
Which physicist proposed that a magnet applies an equal and opposite force on a conductor carrying electric current?
a) Michael Faraday
b) Andre Marie Ampere
c) Joseph Henry
d) William Gilbert
Option b – Andre Marie Ampere
Choose the correct statement regarding magnetic field lines.
a) Magnetic field lines are open curves.
b) Two magnetic field lines can intersect each other.
c) Magnetic field lines form closed curves.
d) Magnetic field has no definite direction or magnitude.
Option c – Magnetic field lines form closed curves.
An electric motor and an electric generator function based on which rule?
a) Fleming’s right-hand rule
b) Fleming’s left and right-hand rules, respectively
c) Fleming’s left-hand rule
d) Fleming’s right and left-hand rules, respectively
Option d – Fleming’s right and left-hand rules, respectively
Which instrument detects electric current through needle deflection caused by the magnetic force on a current-carrying wire?
a) Psophometer
b) Ammeter
c) Potentiometer
d) Galvanometer
Option d – Galvanometer
In 1830, which American scientist constructed the Albany magnet, a powerful electromagnet capable of lifting about 750 pounds of metal?
a) William Gilbert
b) John Cockcroft
c) Edward Purcell
d) Joseph Henry
Option d – Joseph Henry
Carl Friedrich Gauss and Wilhelm Eduard Weber created which device in 1833?
a) Transistor
b) Electromagnetic telegraph
c) Optical maser
d) Particle accelerator
Option b – Electromagnetic telegraph
As the distance from a conductor increases, how does the magnetic field it produces change?
a) It increases
b) It stops
c) It decreases
d) It stays the same
Option c – It decreases
Identify the accurate statement about magnetic field lines inside a bar magnet.
a) They do not exist.
b) They move from S-pole to N-pole.
c) They depend on the cross-section of the magnet.
d) They move from N-pole to S-pole.
Option b – They move from S-pole to N-pole.
The SET of equations that describe electric and magnetic fields and their charge and current sources are known as:
a) Einstein’s equations
b) Newton’s equations
c) Maxwell’s equations
d) Bohr’s equations
Option c – Maxwell’s equations
Which rule determines the direction of the magnetic field around a current-carrying wire?
a) Fleming’s right-hand rule
b) Left-hand rule
c) Fleming’s left-hand rule
d) Maxwell’s corkscrew rule
Option d – Maxwell’s corkscrew rule
When is the induced current in a coil at its maximum?
a) When the motion is not at right angles to the magnetic field
b) When it is at right angles to Electricity
c) When it is at right angles to the electric source
d) When it is at right angles to the magnetic field
Option d – When it is at right angles to the magnetic field
How many of these substances can be attracted to a magnet: 1. Plastic, 2. Carbon, 3. Aluminium, 4. Stainless Steel?
a) 1
b) 2
c) 3
d) None
Option d – None
A charged particle travels through a magnetic field B with velocity v. Which statement correctly describes the force F it experiences?
a) F is greatest when v and B are parallel
b) F is greatest when v and B are anti-parallel
c) F is greatest when v and B are perpendicular
d) F does not depend on the angle between v and B
Option c – F is greatest when v and B are perpendicular
Which material listed below is not ferromagnetic?
a) Iron
b) Cobalt
c) Ferric chloride
d) Silver
Option d – Silver
Which method can be used to identify the polarity of an unmarked bar magnet?
a) Electroscope
b) Iron filings
c) Compass
d) Another unmarked bar magnet
Option c – Compass
Regarding ferromagnetic materials, which statement is accurate?
a) Their magnetization can never disappear.
b) Their magnetization is always opposite to the applied magnetic field.
c) Their magnetization is always perpendicular to the applied magnetic field.
d) Their magnetization may persist even after the applied field is removed.
Option d – Their magnetization may persist even after the applied field is removed.
What effect does heating have on a bar magnet?
a) Its polarity reverses.
b) Its Magnetism increases.
c) Its Magnetism remains unchanged.
d) Its Magnetism weakens or disappears.
Option d – Its Magnetism weakens or disappears.
A straight conductor carries current and has magnetic field lines circulating anticlockwise. How is the current’s direction determined?
a) Right-Hand Thumb rule, downward direction
b) Left-Hand Thumb rule, downward direction
c) Right-Hand Thumb rule, upward direction
d) Left-Hand Thumb rule, upward direction
Option c – Right-Hand Thumb rule, upward direction
Magnetic Field Around a Straight Wire. The magnetic field generated by a straight wire carrying current varies:
a) Inversely with the distance from the wire
b) Directly with the distance from the wire
c) Inversely at close range and directly at greater distances
d) Directly at short range and inversely at long range
Option a – Inversely with the distance from the wire
Fleming’s Right-Hand Rule. If the index finger represents the magnetic field and the thumb shows the motion of the conductor, the middle finger points toward the direction of:
a) force on the conductor
c) Induced current
d) Current
Option c – Induced current
Properties of a Current-Carrying Solenoid. Identify the incorrect statement regarding a solenoid carrying current:
a) The magnetic field inside is uniform
b) It behaves like a bar magnet
c) The internal magnetic field strengthens as current increases
d) Inserting a soft iron core does not change the magnetic field
Option d – Inserting a soft iron core does not change the magnetic field
Principle of an AC Generator. An AC generator works on the principle of:
a) Ohm’s law
b) Joule’s heating effect
c) Faraday’s electromagnetic induction
d) None of these
Option c – Faraday’s electromagnetic induction
Detecting a Magnetic Field. Which device is used to sense the presence of a magnetic field?
a) Voltmeter
b) Ammeter
c) Magnetic needle
d) Motor
Option c – Magnetic needle
motion of a Positive Charge in a Magnetic Field. A positive charge travels south while the magnetic field points north. The charge experiences:
a) A force toward the north
b) A force toward the east
c) A force toward the west
d) No force
Option b – A force toward the east
Direction of Magnetic Field Around a Conductor. The rule used to find the direction of the magnetic field surrounding a straight current-carrying wire is:
a) Fleming’s left-hand rule
b) Right-hand thumb rule
c) Fleming’s right-hand rule
d) Hund’s rule
Option b – Right-hand thumb rule
Right-Hand Thumb Rule. In the Right-Hand Thumb Rule, the thumb is directed towards the direction of:
a) Current
b) Magnetic field
c) motion of the conductor
Option a – Current
Direction of a Suspended Bar Magnet. If a bar magnet is hung from a string, its north pole will point towards:
a) North
b) West
c) South
d) East
Option a – North
Michael Faraday’s Experiment (1831). Which famous experiment was performed by Michael Faraday in 1831?
a) Discovery of natural radioactivity
b) Discovery of quantum magnetometers
c) Discovery of the law of elasticity
d) Discovery of electromagnetic induction
Option d – Discovery of electromagnetic induction
Fleming’s Right-Hand Rule Application. Using Fleming’s right-hand rule, if the magnetic field is directed north and the conductor moves vertically upward, the induced current will flow:
a) Towards east
b) Towards south
c) Towards west
d) Towards south-west
Option a – Towards east
Strength of Magnetic Field. When is the magnetic field strongest?
a) When field lines are crowded
b) When field lines are close together
c) When field lines are not visible
d) When the poles are touching
Option a – When field lines are crowded
Correct Statement on Electromagnetism. Which of the following statements is correct?
a) Only Ampere’s law describes the relationship between current and magnetic field
b) Only Maxwell’s equations govern electric and magnetic fields without charges or currents
c) Neither statement 1 nor 2
d) Both statements 1 and 2
Option a – Only Ampere’s law describes the relationship between current and magnetic field
Discovery by Hans Christian Oersted. Hans Christian Oersted discovered that electric current in a wire deflects a magnetic compass needle in:
a) 1850
b) 1830
c) 1820
d) 1810
Option c – 1820
Discovery of Magnetic force Between Wires. Who discovered that a current-carrying wire can attract or repel a nearby current-carrying wire?
a) Guglielmo Marconi
b) James Maxwell
c) Andre-Marie Ampere
d) Michael Faraday
Option c – Andre-Marie Ampere
Magnetic Field of a Circular Coil. A circular coil with ‘n’ turns produces a magnetic field that is how many times stronger than that of a single turn?
a) 2n
b) 3n
c) n
d) 4n
Option c – n
Ferromagnetic Element. Which metallic element is known as ferromagnetic due to its strong magnetic attraction?
a) Iron
b) Molybdenum
c) Gold
d) Aluminium
Option a – Iron
Neutral Point of a Bar Magnet. The neutral point in the magnetic field of a horizontally placed bar magnet is the point where:
a) The magnetic field changes direction
b) The magnetic field is weakest
c) The magnetic field is strongest
d) The magnetic field is zero
Option d – The magnetic field is zero
Law of Induced EMF. Which law states that the induced EMF in a circuit equals the rate of change of magnetic flux through it?
a) Coulomb’s law
b) Faraday’s law
c) Laplace’s law
d) Kirchhoff’s laws
Option b – Faraday’s law
Best Material for Permanent Magnets. Which element is most effective for making a permanent magnet?
a) Zinc
b) Aluminium
c) Copper
d) Steel
Option d – Steel
Statement About Magnetic Flux. Which of the following statements about magnetic flux is correct?
a) Magnetic flux is a Vector quantity
b) Two magnetic field lines can intersect
c) The NET magnetic flux through any closed surface is zero
d) Earth’s magnetic poles coincide with its geographic poles
Option c – The NET magnetic flux through any closed surface is zero
Electromagnetic Waves Experiment. Which physicist is renowned for generating and proving the existence of electromagnetic waves?
a) J.J. Thomson
b) Isaac Newton
c) Heinrich Rudolf Hertz
d) Albert Einstein
Option c – Heinrich Rudolf Hertz
Direction of Magnetic Field from Deflection. An argon positive ion fired east is deflected south by a magnetic field. The magnetic field direction is:
a) Upward
b) Downward
c) Toward north
d) Toward south
Option a – Upward
Incorrect Physicist–Discovery Pair. Which of the following pairs is incorrect?
a) Albert Einstein – Explanation of the photoelectric effect
b) Galileo Galilei – wave theory of Light
c) Heinrich Rudolf Hertz – Generation of electromagnetic waves
d) Michael Faraday – Laws of electromagnetic induction
Inventor of the Voltaic Pile. Who invented the voltaic pile, the precursor to the modern battery, in 1800?
a) George Simon
b) Andre-Marie Ampere
c) Hans Christian Oersted
d) Alessandro Volta
Option d – Alessandro Volta
Geometric vs Magnetic Length. Which is the correct relationship between geometric length (L) and magnetic length (Lm)?
a) L = (6/5) Lm
b) Lm = (5/6) Lg
c) Lm = 2R
d) L = Lm
Option b – Lm = (5/6) Lg
Radius of Charged Particle Path. The radius of curvature of a charged particle moving in a uniform magnetic field is directly proportional to its:
a) Charge
b) energy
c) Field strength
d) Momentum
Option d – Momentum
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