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 43 of 59
- A. 0V, 3A
- B. 150V, 3A
- C. 150V, 6A
- D. 0V, 8A
Explanation: The voltage and are equal and opposite so voltmeter reading will be zero.Given R = 30 Ω, XL = Xc = 25 ΩThe current I isI = V / √[ R² + (XL…
Correct answer: 0V, 8A- A. 0V, 0.47A
- B. 1.68V, 0.47A
- C. 0V, 1.4 A
- D. 5.6V, 1.4 A
Explanation: Z = √{(R)² + (XL − Xc)²}R = 10 Ω, XL = ωL = 2000 × 5 × 10⁻³ = 10 ΩXc = 1 / (ωC) = 1 / (2000 × 50 × 10⁻⁶) = 10 Ω i.e.
Correct answer: 5.6V, 1.4 A- A. 0.016 H
- B. 0.29 H
- C. 0.4 H
- D. 0.80 H
Explanation: e = L di/dt ⇒ 4 = L × (5 − (−5)) / 0.04 ⇒ L = 0.016 H
Correct answer: 0.016 H- A. 1/(mass of particle)
- B. 1/(charge of particle)
- C. 1/(applied magnetic field)
- D. Both "B" and "C"
Explanation: q v B = mv² / r⇒ q B = mv / r⇒ r = mv / qB⇒ r ∝ 1 / qB
Correct answer: Both "B" and "C"- A. Parallel to the wire
- B. Clockwise
- C. Perpendicular to wire
- D. Anti-clockwise
Explanation: If current flows from top towards bottom through a wire then the direction of magnetic lines of force would be is clockwise by using right…
Correct answer: Clockwise- A. Current
- B. Force
- C. EMF
- D. Temperature
Explanation: Right hand palm rule is used to find the direction of force
Correct answer: Force- A. Lorentz force
- B. Self-inductance
- C. Magnetic flux
- D. Magnetic induction
Explanation: Magnetic induction, also known as electromagnetic induction, refers to the process by which a changing magnetic field induces an electric…
Correct answer: Magnetic induction- A. Downward direction
- B. Into the paper
- C. Upward direction
- D. Out of the paper
Explanation: The electron will be deflected upward in the plane of the paper.
Correct answer: Upward direction- A. 1.758 x 10^-11 C kg-1
- B. 9.58 x 10^7 C kg-1
- C. 1.858 x 10^11 C kg-1
- D. Zero
Explanation: For neutron q=e=0 it is a neutral specie.
Correct answer: Zero- A. 4πx107 Wb A-1 m-1
- B. 4πx107 Wb A m-1
- C. 4πx10-7 Wb A-1 m
- D. 4πx10-7 Wb A-1 m-1
Explanation: (Total current enclosed by the loop) Where µ₀ is a constant, known as permeability of free space.
Correct answer: 4πx10-7 Wb A-1 m-1- A. 0o
- B. 60o
- C. 30o
- D. 900
Explanation: F = q v B sin θ = Fₘₐₓ sin θ = Fₘₐₓ sin 30° = 0.5 Fₘₐₓ
Correct answer: 30o- A. Half
- B. Remain same
- C. Double
- D. Zero
Explanation: e/m of electron is constant value. So. it does not depend upon change in magnetic field.
Correct answer: Remain same- A. Zero
- B. Up
- C. Down
- D. East
Explanation: F = qvB sin θ, where R is a magnetic force, q is the charge, B is the magnetic field, v is the velocity, and θ is the angle between the…
Correct answer: Zero- A. Circles that are concentric with the wire
- B. Opposite to the direction of the current
- C. Radially outward from the wire
- D. Radially inward toward the wire
Explanation: According to right-hand rule,grasp the conductor in the right hand, put the thumb in the direction of conventional current.
Correct answer: Circles that are concentric with the wire- A. Tends to get shorter
- B. Tends to rotate about its axis
- C. Tends to get longer
- D. Produces zero magnetic field at its center
Explanation: Each turn of helical coil carries current in same direction. Wire carrying current in same direction attract each other.
Correct answer: Tends to get shorter856. If an electron and a proton enter into a magnetic field perpendicularly with the same momentum:
- A. The proton will deflect more
- B. Both will deflect equally
- C. The electron will deflect more
- D. They will no deflect at all
Explanation: As r=p/eBp is same ,B is same and e is also same so that radius will also be same and both particles will deflect equally.
Correct answer: Both will deflect equally857. Amperean path is a:
- A. Circular path
- B. Elliptical path
- C. Closed path
- D. Spherical path
Explanation: Amperean path is any closed path whether it is spherical circular or triangular.
Correct answer: Closed path- A. Magnetic field strength
- B. Magnetic flux density
- C. Magnetic induction
- D. All of these
Explanation: Using Ampere's circuital law the magnetic flux density "B" at any point due to a current carrying conductor can be calculated
Correct answer: All of these- A. Front part
- B. Back part
- C. Left wingtip
- D. Right wingtip
Explanation: To determine which part of the plane will be negatively charged, we apply the right-hand rule.
Correct answer: Right wingtip- A. F must be perpendicular to V but not necessarily to B
- B. F must be perpendicular to /3. but not necessarily to V
- C. V must be perpendicular to 173. but not necessarily to F
- D. F must be perpendicular to both V and B
Explanation: F=e(VxB)F = qv × B. The force F is perpendicular to the direction of the magnetic field B.
Correct answer: F must be perpendicular to both V and B