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 4 of 59
- A. Proton
- B. Alpha particle
- C. Photon
- D. All of these options are correct
Explanation: The magnitude of deflection depends upon two factors: The mass (m) of the ion - the lighter it is the more it will be deflected.
Correct answer: Proton- A. Circular
- B. Straight line
- C. Spherical
- D. Helical
Explanation: Force is given by F = qvBsinθ, where F, q, v and B are the force, charge on particle, velocity of particle and magnetic field strength…
Correct answer: Helical- A. Moves in the direction of the field
- B. Moves perpendicular to the direction of the field
- C. Moves opposite to the direction of the field
- D. Remains stationary
Explanation: A strong magnetic field is applied to a stationary electron. Then the electron remains stationary because magnetic force act on moving…
Correct answer: Remains stationary- A. Decreases
- B. Increases then decreases
- C. Becomes zero
- D. Remains constant
Explanation: When a charged particle enters a strong magnetic field, its kinetic energy remains constant.
Correct answer: Remains constant- A. deflect upwards
- B. deflect downward
- C. speed up
- D. speed down
Explanation: Option C is correct since over here the velocity vector and magnetic field vector are in the same direction so there is no magnetic force.
Correct answer: speed up- A. f= mB/πC
- B. f= 2πeB/m
- C. f= eB/2πm
- D. f= 2πc/mB
Explanation: For a cyclotron Centripetal force is provided by magnetic force.By derivation, A, B & C are wrong.
Correct answer: f= eB/2πm- A. If an electron's movement is parallel to the magnetic field, it will experience no force.
- B. If an electron's movement is parallel to the magnetic field, it will rotate anticlockwise.
- C. If an electron enters perpendicular to the magnetic field, it will move in a circular path.
- D. If an electron enters perpendicular to the magnetic field, the force experienced will be maximum.
Explanation: The correct answer is Option D: If an electron enters perpendicular to the magnetic field, the force experienced will be maximum.
Correct answer: If an electron's movement is parallel to the magnetic field, it will rotate anticlockwise.- A. Hyperbola
- B. Helix
- C. Parabola
- D. Circular
Explanation: If a charged particle is projected perpendicular to a uniform magnetic field, then the particle revolves in a circular path and its…
Correct answer: Circular- A. qBr
- B. qB/r
- C. q/(Br)
- D. B
Explanation: Here the centripetal force will balance the magnetic force. So, mv2/r=qvB or mv=qBr Thus, linear momentum, p=mv=qBr
Correct answer: qBr- A. Up
- B. Down
- C. Right
- D. Towards us
Explanation: The correct answer is D. When a proton enters a magnetic field vertically upward from the left side, it experiences a force perpendicular…
Correct answer: Towards us- A. Parabolic
- B. Circular
- C. Parallel to v
- D. Parallel to B
Explanation: The magnetic force will act perpendicular to velocity at every instant ,path will be circle.
Correct answer: Circular- A. Towards the outward
- B. Towards the inward
- C. Parallel to its motion
- D. No force acts on it
Explanation: The electron is moving along the axis with velocity V Force = q(V x B) Velocity and magnetic field are in the same direction or at an…
Correct answer: No force acts on it- A. Strength
- B. Flux
- C. Magnetic flux density
- D. Density
Explanation: .Option A) Strength is not correct because it is a general term and does not specifically refer to the strength of a magnetic field.Option…
Correct answer: Magnetic flux density- A. Flux
- B. Magnetization
- C. Magnetic intensity
- D. Flux intensity
Explanation: Correct option is C.The magnetic flux density or magnetic induction is also known is magnetic field strength , B.
Correct answer: Magnetic intensity- A. Flux
- B. Density
- C. Magnetic strength
- D. Magnetic flux density
Explanation: Magnetic field strength is a measure of the intensity of a magnetic field in a given area of that field.
Correct answer: Magnetic flux density- A. four times
- B. two times
- C. three times
- D. six times
Explanation: Option A is correct since magnetic energy density is proportional to the square of the magnetic field as shown in the image : Therefore…
Correct answer: four times- A. Not intersecting
- B. Intersect near south pole
- C. Intersect near north pole
- D. Intersect everywhere
Explanation: If magnetic field lines intersect each other, then at the intersection point there will be two directions of the same field which is not…
Correct answer: Not intersecting- A. B = μonI
- B. B = μoN/L
- C. B = μoIN
- D. B = μoINL
Explanation: B = μonl is the formula for magnetic field across a solenoid.
Correct answer: B = μonI- A. Henry
- B. Henry/m
- C. Dimensionless
- D. Henry/sq.m
Explanation: Relative permeability is known to be a dimensionless quantity and it is the ratio of two quantities with the same units, and hence, the…
Correct answer: Dimensionless- A. BA=3BB
- B. BA=(BB)/3
- C. BA=BB
- D. BA=4BB
Explanation: Magnetic field in solenoid is independent of length and cross section area;B= 𝛍 nIn=I/Ln= number of turnsI=currentL=lengthB magnetic flux…
Correct answer: BA=BB