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 59 of 59
- A. 1N
- B. 1/2 N
- C. 1/3 N
- D. 1/4 N
Explanation: Answer; B (Answer should be A) F=BILsintheta theta= 90° F= 0.5× 2× 1× sin90 = 1 N
Correct answer: 1N- A. will attract each other
- B. will repel each other
- C. will have no effect on each other
- D. None of the above
Explanation: If two parallel wires carry current in opposite directions, they repel each other, whereas if two parallel wires carry current in the same…
Correct answer: will repel each other- A. B = µ°NI ℓ
- B. B = µ ℓ / °Nℓ
- C. B = Nℓ / °ℓ
- D. B = µ ℓ ℓ / °N
Explanation: According to Ampere's law, the magnetic field (B) produced inside a solenoid is directly proportional to the product of the permeability…
Correct answer: B = µ°NI ℓ- A. 1.2N
- B. 3 dynes
- C. 10^7 dynes
- D. 10^5 dynes
Explanation: This option is correct as 10^7 dynes are equal to 100N. The force can be calculated by: F = BILsinθ In this case, the cylinder is carrying…
Correct answer: 10^7 dynes- A. Attracted by poles
- B. Attracted by North pole & repelled by south pole
- C. Attracted by south pole & repelled by North pole
- D. Repelled by the poles
Explanation: Diamagnetic substances are those that do not have unpaired electrons in their atoms.
Correct answer: Repelled by the poles- A. Magnetic flux
- B. Magnetic flux density
- C. Magnetic permeability
- D. None of these
Explanation: The force exerted on a wire of length one meter carrying a current of one ampere lying normal to the magnetic field is called magnetic…
Correct answer: Magnetic flux density- A. 10A
- B. 50A
- C. 100A
- D. 500A
Explanation: Given that:Length = L = 10cm = 10 × 10-2 mMagnetic field = B = 0.5TForce = F = 5NCurrent = I =?The force experienced by a current-carrying…
Correct answer: 100A- A. attract each other
- B. repel each other
- C. have no force of attraction or repulsion
- D. remain stationary
Explanation: Parallel wires with current in the same direction exert attractive forces on eachother.
Correct answer: attract each other- A. 2 x 10^-5N to the left
- B. 3 x 10^-5N to the right
- C. 5 x 10^-5N to the right
- D. 5 x 10^-5N to the left
Explanation: Two parallel current carrying wires experience equal, but opposite magnetic force.
Correct answer: 5 x 10^-5N to the left- A. Hysteresis
- B. Ferromagnetism
- C. The Curie law
- D. Gauss's law for magnetism
Explanation: Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align…
Correct answer: Hysteresis- A. Surface
- B. Closed surface
- C. Path
- D. Closed path
Explanation: Ampere's law states that the total magnetic field (B) induced around any closed path is equal to the ratio of the total current passing…
Correct answer: Closed path- A. NmA-1
- B. Nm2 A-1
- C. NAm-¹
- D. NmA-2
Explanation: The unit of magnetic flux is Weber, which is equal to J/A, which is then equal to Nm/A-1.
Correct answer: NmA-11173. voltxsecond is equal to:
- A. gauss
- B. weber
- C. henry
- D. tesla
Explanation: Henry is the unit of inductance, which is equal to 1 volt*sec/ampere, which is the voltage across a conductor directly proportional to the…
Correct answer: henry- A. μ0N2AL
- B. μ0N2 A/L
- C. μ0N2L/A
- D. μ0NL/A
Explanation: The formula for self-inductance of a solenoid is L=μoN2A/L
Correct answer: μ0N2 A/L- A. Resistance
- B. Conductance
- C. Inductance
- D. Capacitance
Explanation: The reluctance of a ferromagnetic material is similar to the resistance of a conductor.
Correct answer: Resistance1176. Weber is the unit of
- A. Electric potential
- B. Electric intensity
- C. Magnetic intensity
- D. Magnetic flux
Explanation: The weber (Wb) is the unit of magnetic flux, which is a measure of the amount of magnetic field that passes through a given area.
Correct answer: Magnetic flux