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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- A. Parallel to the conductor
- B. In clockwise direction
- C. Anticlockwise direction
- D. None of these
Explanation: The direction of magnetic field in the conductor can be found out by right hand thumb rule.
Correct answer: Anticlockwise direction- A. 1 tesla
- B. 10-3tesla
- C. 10 tesla
- D. 10-4tesla
Explanation: We know that:1 Tesla = 104Gauss=> 1 gauss = 10-4 TeslaBoth Tesla and Gauss are units of magnetic induction.Electromagnetic or magnetic…
Correct answer: 10-4tesla- A. An isolated magnetic pole
- B. Static electric charge
- C. Nonmagnetic substance
- D. Current loop
Explanation: A current loop, such as a wire carrying electric current in a circular path, creates a magnetic field around it.
Correct answer: Current loop- A. Lines start at north pole and ends at south pole
- B. Lines never touch or cross each other
- C. The lines are curved
- D. The magnetic field is strongest when the lines are farthest.
Explanation: Option D is Incorrect because the magnetic field is strongest where the lines are closest together, indicating a higher field strength.
Correct answer: The magnetic field is strongest when the lines are farthest.- A. Wbm⁻¹
- B. Wbm
- C. Wbm-2
- D. Wb
Explanation: Option C is Correct, as it correctly represents Weber per square meter (Wb/m² or Tesla, T).
Correct answer: Wbm-2- A. NBA
- B. BA
- C. ½ NBA
- D. BAcos(θ)
Explanation: In this scenario we have to find the magnetic flux linkage. Since we already have the solenoid's wire being perpendicular to the field…
Correct answer: NBA- A. 360°
- B. 180°
- C. 90°
- D. 45°
Explanation: The magnetic flux is equal to the magnetic field strength times the area through which the field lines pass times the angle between the…
Correct answer: 360°- A. Circular
- B. Rectangular
- C. Square
- D. Flux is independent of shape
Explanation: The magnetic flux through a surface depends on the magnetic field strength and the angle between the magnetic field lines and the surface.
Correct answer: Flux is independent of shape- A. Electric flux
- B. Magnetic flux
- C. Electric flux density
- D. Gravitational flux
Explanation: Magnetic flux is a measure of the total magnetic field passing through a given area.
Correct answer: Magnetic flux- A. An electric field only
- B. A magnetic field only
- C. Both magnetic and electric field
- D. Magnetic and gravitational field
Explanation: Magnetic and gravitational field: This option is incorrect. A moving electric charge does not generate a gravitational field.
Correct answer: Both magnetic and electric field- A. proton
- B. electron
- C. both will suffer greater defection
- D. None of these
Explanation: The deflection is inversely proportional to mass, so for an electron and a proton moving with the same velocity, an electron with lighter…
Correct answer: electron- A. Kinetic energy
- B. Magnitude of velocity
- C. Direction of velocity
- D. All of these
Explanation: When a charged particle enters a uniform magnetic field, the magnetic force acts perpendicular to the velocity of the particle.
Correct answer: Direction of velocity- A. F = qvB
- B. F = qE
- C. F = 0
- D. F = mv2/r
Explanation: When a charged particle moves parallel to a magnetic field, the force acting on it is zero because the angle between the velocity and…
Correct answer: F = 0- A. Both electric and magnetic field
- B. Both magnetic and gravitational field
- C. A magnetic field only
- D. An electric field only
Explanation: The definition of magnetic field: The region where a moving charge particle experiences a force, provided that it moves perpendicular to…
Correct answer: A magnetic field only- A. Circle
- B. Helix
- C. Ellipse
- D. Straight line
Explanation: The charged particle has a velocity that is neither perpendicular nor parallel (along) to the magnetic field, i.e it is moving with an…
Correct answer: Helix- A. Of magnitude B/E and parallel to B
- B. Of magnitude E/B and parallel to B
- C. Of magnitude B/E and perpendicular to both ⃑E and ⃑B
- D. Of magnitude E/B and perpendicular to both ⃑E and ⃑B
Explanation: If velocity must remain constant, the net force must be zero, so electric and magnetic forces must be equal.magnetic force = electric…
Correct answer: Of magnitude E/B and perpendicular to both ⃑E and ⃑B- A. Charged
- B. Charge/mass(e/m)
- C. Kinetic energy
- D. Mass
Explanation: The formula used in mass spectrometry is q/m = v/Br where q is the charge, m is mass, v is velocity, B is magnetic field strength, and r…
Correct answer: Charge/mass(e/m)- A. 1 field
- B. 3 fields
- C. 2 fields
- D. 4 fields
Explanation: A moving charged particle is surrounded by three fields:Electric Field: This field arises due to the charge of the particle itself and…
Correct answer: 3 fields1159. A proton is projected with a uniform velocity 'v' along the axis of a current carrying solenoid.
- A. The proton will be accelerated along the axis.
- B. The proton path will be circular about the axis.
- C. The proton moves along a helical path.
- D. The proton will continue to move with velocity 'v' along the axis.
Explanation: The proton is traveling in the same direction as the solenoid's axis. Because the magnetic field inside the solenoid is homogenous and…
Correct answer: The proton will continue to move with velocity 'v' along the axis.- A. Wire in a helix around a box
- B. Wire in a helix around a cylindrical surface
- C. Wire in a helix on a plain surface
- D. Cannot be made using wire
Explanation: A solenoid is an instrument that consists of copper coiling over a cylinder designed to create a strong magnetic field inside the coil…
Correct answer: Wire in a helix around a cylindrical surface