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 47 of 59
- A. The energy of the particle
- B. The momentum of the particle
- C. The intensity of the field
- D. The charge on the particle
Explanation: Option B is correct.We know that the radius of the circular path in the magnetic field is given by: r= mv/qB .
Correct answer: The momentum of the particle- A. Electron
- B. Neutron
- C. Proton
- D. Sodium ion
Explanation: Option B is correct.The protons, cathode rays and the alpha particles are charged particles, so these are deflected by the magnetic field.
Correct answer: Neutron- A. Helical
- B. Elliptical
- C. Circular
- D. Straight line
Explanation: Option A is correct.When θ = 0o path is straight When θ = 90° path is circular. When 0° <θ< 90o path is helical.
Correct answer: Helical- A. K.E increases, P.E decreases
- B. K.E decreases, P.E increases
- C. Both A and B
- D. None of these
Explanation: Option D is correct.As the charged particle enters perpendicular to the magnetic field, the force will act perpendicular to the velocity.
Correct answer: None of these- A. Direction
- B. Speed
- C. Energy
- D. No change
Explanation: Option A is correct.When a particle is moved in magnetic field, the magnetic force is perpendicular to velocity and magnetic field.
Correct answer: Direction- A. Stationary charge
- B. A moving positive charge only
- C. A moving negative charge only
- D. Moving positive and negative charges both
Explanation: Option D is correct.The magnetic field is caused by both moving positive and negative charges.
Correct answer: Moving positive and negative charges both- A. The direction of the velocity changes
- B. Magnitude of the magnetic force
- C. Speed
- D. Direction
Explanation: Option C is correct.We know that force on a charged particle q due to magnetic field B is given by: F =q( v × B ) where v is the velocity…
Correct answer: Speed- A. Sum of electric & magnetic force
- B. No force will act on it
- C. Difference of electric & magnetic force
- D. None of above
Explanation: Option A is correct.The total force acting on a particle moving in a region of both electric and magnetic fields is called the Lorentz…
Correct answer: Sum of electric & magnetic force- A. 0o
- B. 45o
- C. 90o
- D. 180o
Explanation: Therefore, the correct answer is option C) 90o. When the angle between the field and the length of the conductor is 90 degrees, the force…
Correct answer: 90o- A. kgsm-1A-1
- B. kg mA
- C. kgs-1A-1
- D. kgs-2A-1
Explanation: The correct answer is option D) kgs^-2 A^-1.
Correct answer: kgs-2A-1- A. 0o
- B. 30o
- C. 60o
- D. 90o
Explanation: The magnetic flux (Φ) is a measure of the magnetic field passing through a surface.It is given by the formula:Φ = B * A * cos(θ)The…
Correct answer: 0o- A. Tesla
- B. Wbm-2
- C. NA-1m-1
- D. All of them
Explanation: All of these options are correct and represent different ways of expressing magnetic flux density.i- Teslaii-Wbm-2iii-NA-1m-1
Correct answer: All of them- A. Along x-axis
- B. Along y-axis
- C. Along z-axis
- D. In xy-plane
Explanation: The explanation of this question is given below:
Correct answer: Along z-axis- A. B=μonI
- B. B=μon2I
- C. B= 4μonI
- D. B= 4μon2I
Explanation: The magnetic field is given by the formulaB = μ0nIWhereB is the magnetic fieldn is the number of turns in the solenoidI is the currentμ0…
Correct answer: B=μonI- A. Permeability
- B. Position vector
- C. Number of turns
- D. Flow of current
Explanation: The magnetic field inside the solenoid is not dependent on the position vector.
Correct answer: Position vector- A. East
- B. North
- C. West
- D. South
Explanation: When electron, moving horizontally toward the east, enters a magnetic field directed upward, it experiences a force due to the magnetic…
Correct answer: North- A. Straight line
- B. Ellipse
- C. Helix
- D. Circle
Explanation: When a charged particle moves perpendicular to a magnetic field, it experiences a force called the magnetic Lorentz force.
Correct answer: Circle- A. Stationary charges
- B. Stationary and moving charges
- C. Moving charges
- D. Law of motion
Explanation: Magnetism is intimately related to moving charges through the fundamental principles of electromagnetism.
Correct answer: Moving charges- A. 0o
- B. 90o
- C. 60o
- D. 180o
Explanation: The magnetic flux through a coil or loop of wire placed in a magnetic field depends on the angle between the magnetic field lines and the…
Correct answer: 0o- A. Conductance
- B. Megnetic flux
- C. Electric current
- D. Elrctric flux
Explanation: The weber is a unit of measure for magnetic flux, which is the measure of the total magnetic field passing through a given area or circuit.
Correct answer: Megnetic flux