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 37 of 59
- A. Magnitude of velocity only
- B. Magnitude and direction of velocity
- C. Only the direction of velocity
- D. Neither direction nor magnitude of velocity
Explanation: The magnetic force acts on a charged particle moving in a magnetic field, which is given by the equation F = q(v × B), where F is the…
Correct answer: Only the direction of velocity- A. 4 V
- B. 10 V
- C. Zero
- D. 32 V
Explanation: The induced EMF (electromotive force) in a conducting loop is determined by Faraday's law of electromagnetic induction, which states that…
Correct answer: Zero- A. Loop A will induce an EMF equal to that of Loop B.
- B. Loop A is smaller than Loop B.
- C. Loop B is smaller than Loop A.
- D. Both will have zero induced EMF.
Explanation: The induced EMF in a loop is directly proportional to the rate of change of magnetic flux through the loop, as described by Faraday's law…
Correct answer: Loop A will induce an EMF equal to that of Loop B.- A. Only decrease
- B. Only increase
- C. Be constant
- D. Be Changed
Explanation: According to Faraday's law of electromagnetic induction, induced emf is generated when there is a change in magnetic flux through a coil.
Correct answer: Be Changed- A. 2400V
- B. 1200V
- C. 24000V
- D. 200 V
Explanation: The primary winding of the transformer has a voltage of 120 V and a turn ratio of 20.
Correct answer: 2400V- A. 0.15 V
- B. 0.30 V
- C. 0.45 V
- D. 0.60 V
Explanation: To calculate the induced electromotive force (EMF) in this scenario, we can use Faraday's Law of Electromagnetic Induction, which states…
Correct answer: 0.30 V- A. 1200 turns
- B. 1000 turns
- C. 800 turns
- D. 600 turns
Explanation: To calculate the number of turns in the secondary winding, we can use the relationship between the voltage, current, and number of turns…
Correct answer: 1000 turns- A. BIL
- B. B/IL
- C. IL/B
- D. B + IL
Explanation: This is the correct answer. When a conductor carrying a current I is placed in a magnetic field B at an angle of 90°, it experiences a…
Correct answer: BIL- A. North pole
- B. Are ionized
- C. South pole
- D. None of these
Explanation: Option D) "None of these" is the correct optionPhotons, as electromagnetic waves, do not carry an electric charge, and they are not…
Correct answer: None of these- A. No deflection
- B. Deflection on one side only
- C. Deflection to the left and right with constant amplitude
- D. Deflection to the left and right with decreasing amplitude
Explanation: As the magnet oscillates in and out of the coil, it induces an electromotive force (EMF) in the coil due to the changing magnetic flux.
Correct answer: Deflection to the left and right with decreasing amplitude- A. Zero degree
- B. 90 degree
- C. 60 degree
- D. 30 degree
Explanation: Magnetic flux (Φ) through a finite area is given by:Φ = B × A × cos(θ)where:B = magnetic field strengthA = area of the planeθ = angle…
Correct answer: Zero degree- A. mechanical energy
- B. electricity
- C. electromagnetic force
- D. magnetic energy only
Explanation: The ability to produce an electromotive force (EMF) by changing the magnetic field inside a coil is the principle behind electromagnetic…
Correct answer: electricity- A. Direct current
- B. Pulsating current
- C. Alternating current
- D. Variable current
Explanation: A generator, also known as an alternator, produces an alternating current (AC).
Correct answer: Alternating current- A. Magnetic flux
- B. Magnetic field intensity
- C. Magnetic induction
- D. Self inductance
Explanation: The formula for magnetic force is F=Bqv. Manipulating this equation to get B=F/qv substantiates B as the answer.
Correct answer: Magnetic field intensity- A. 1.48 N (attractive)
- B. 1.48 N (repulsive)
- C. 2.96 (repulsive)
- D. Zero
Explanation: This question does not require any calculation. Just know that if we add -5C to both, it will leave the +5C point charge to become a…
Correct answer: Zero- A. e/m2(VB2r2)
- B. e/m=(V/Br)2
- C. e/m=V.r/B
- D. e/m=V/Br
Explanation: When an electron enters a region in which there is a uniform magnetic field, B, perpendicular to the velocity, v, of the electron…
Correct answer: e/m=V/Br- A. If an electron's movement is parallel to the magnetic field. it will rotate
- B. If electron's movement is parallel to magnetic field, it Will rotate anticlockwise
- C. If an electron enters perpendicular to the field force it would be parallel to the plane
- D. If an electron enters perpendicular to the field force will be maximum
Explanation: If an electron enters perpendicular to the field, the force will be maximum, because according to theformula of force on a moving…
Correct answer: If an electron enters perpendicular to the field force will be maximum- A. At an angle of 180 degrees with the galvanometer
- B. Parallel with galvanometer
- C. At an angle of 45 degrees With the galvanometer
- D. Perpendicular with the galvanometer
Explanation: Since Galvanometer is a very sensitive instrument therefore it can't measure heavy currents.
Correct answer: Parallel with galvanometer- A. Joule
- B. Watt
- C. Newton
- D. Henry
Explanation: Wb amp\ meter =? wb=BxA Wb=Nm\A Wb amp\ metre= [Nm\A] xA\m Wb amp\ metre =NmxA\Axm By cancellation of the common values, we get Newton [N].
Correct answer: Newton- A. magnitude of charge
- B. speed of the moving charge V
- C. magnitude field of induction B
- D. all of these
- E. none of these
Explanation: Force on the charge in the magnetic field depends on the magnitude of the charge, the velocity of the charge, and the magnetic field of…
Correct answer: all of these