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 24 of 59
- A. Post office box
- B. AVO meter
- C. Meter bridge
- D. Microscope
Explanation: The correct answer is the AVO meter, also known as a multimeter. It combines an ammeter, voltmeter, and ohmmeter into one device using a…
Correct answer: AVO meter- A. 2.71 N
- B. 0.39 N
- C. 6.61 N
- D. 7.61 N
- E. 9.91 N
Explanation: The force on a current-carrying conductor in a magnetic field is given by the formula: F = ILBsin(θ), where:I is the current (10.0 A)L is…
Correct answer: 0.39 N- A. 10 Henrys
- B. 20 Henrys
- C. 30 Henrys
- D. 40 Henrys
- E. 50 Henrys
Explanation: To find the self-inductance (L) of the circuit, we use the formula for induced electromotive force (e.m.f.): E = L(∆I/∆t).
Correct answer: 20 Henrys- A. Gravitational Field
- B. Magnetic Field
- C. Magnetic Flux
- D. Flux
Explanation: The correct answer is Magnetic Field. A magnetic field is defined by the force it exerts on moving charges.
Correct answer: Magnetic Field- A. a copper ion
- B. a helium nucleus
- C. an electron
- D. a proton
Explanation: The deflection of a particle depends upon its mass to charge ratio. Since the mass of electron is too less as compared to its charge so it…
Correct answer: an electron- A. 2√3 W
- B. √3 W
- C. √(3/2) W
- D. √(3/4) W
Explanation: The torque (τ) on a magnetic needle in a uniform magnetic field is given by the formula τ = mB sin(θ), where m is the magnetic moment, B…
Correct answer: √3 W- A. 30Nm
- B. 3073 Nm
- C. 60Nm
- D. 604Nm
Explanation: τ = MBsinθTorque = 200×0.30×sin30 = 30 Nm.
Correct answer: 30Nm- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. Option E
Explanation: The magnetic field lines form concentric circles around the wire. If you wrap your right hand's fingers around the wire with your thumb…
Correct answer: Option D- A. 1 Henry
- B. 2 Henry
- C. 3 Henry
- D. 4 Henry
- E. 6 Henry
Explanation: Initial current, I1=5.0AFinal current, I2=0AChange in current, dl=I1−I2=5ATime taken for the charge, t=0.1sAverage emf, e=200VFor self…
Correct answer: 4 Henry- A. Magnetic field and charge only
- B. Magnetic field and speed of the charge only
- C. Charge and speed of the charge only
- D. Magnetic field, charge, and speed of the charge
Explanation: The magnitude of the magnetic force between them depends on how much charge is in how much velocity in each of the two objects and…
Correct answer: Magnetic field, charge, and speed of the charge- A. 47 rad s-1
- B. 49 rad s-1
- C. 43 rad s-1
- D. 45 rad s-1
Explanation: To determine the angular velocity (ω) of the coil, we use the formula for the peak emf (E) induced in a rotating coil in a magnetic field…
Correct answer: 47 rad s-1- A. NA / m
- B. NmA
- C. Nm-1A-1
- D. Nm / A
Explanation: The formula for the magnetic field density (B) is: B=F/IL {where F is the force, I is the current and L is the length of the conductor.}…
Correct answer: Nm / A- A. Originate at south pole and terminate at north pole
- B. Pass through the magnet
- C. Originate at north pole and terminate at south pole
- D. Go away from both the poles
Explanation: The correct answer is Option C: The magnetic lines of force originate at the north pole and terminate at the south pole.
Correct answer: Originate at north pole and terminate at south pole- A. Normal at that point
- B. Axis of the magnetic line of force at that point
- C. The tangent at that point
- D. Perpendicular to the axis of the solenoid
Explanation: The correct answer is Option C. The direction of the magnetic field at a point on magnetic lines of force is along the tangent to the…
Correct answer: The tangent at that point- A. 6.9 x 10^-2 V
- B. 5.7 x 10^-2 V
- C. 4.6 x 10^-2 V
- D. 3.13 x 10^-2 V
- E. 2.3 x 10^-2 V
Explanation: The formula for emf is E=velocity x length of rod x magnetic field intensity The length of rod is 25 cm so first it must be converted into…
Correct answer: 3.13 x 10^-2 V- A. Simple induction
- B. Mutual induction
- C. Self-induction
- D. EMF induction
Explanation: The correct answer is self-induction. This is because a changing current in a coil leads to a changing magnetic field, which induces an…
Correct answer: Self-induction- A. Is parallel to current I only
- B. Is perpendicular to current I only
- C. Is perpendicular to magnetic field B only
- D. Is perpendicular to both current I and magnetic field B
Explanation: The correct answer is that the force is perpendicular to both the current I and the magnetic field B.
Correct answer: Is perpendicular to both current I and magnetic field B- A. BA
- B. A
- C. B
- D. B^2
Explanation: We know that the formula for magnetic flux is:Φ = BAcosθwhere θ is the angle between a perpendicular vector to the area and the magnetic…
Correct answer: BA479. Under what condition the force acting on the charge particle moving in the magnetic field maximum?
- A. Charge particle moves perpendicular to the velocity vector
- B. Charge particle moves in straight line with the velocity vector
- C. Charge particles moves with an angle 60 degrees with the velocity vector
- D. All of the above
Explanation: The force will have a magnitude F = qvBsinθWhere F is the force on a charged particle in a magnetic fieldq is the magnitude of the chargev…
Correct answer: Charge particle moves perpendicular to the velocity vector- A. Behaves like the north pole
- B. Behaves like the south pole
- C. Becomes a magnet of varying poles
- D. Does not behave like a magnet
Explanation: A current-carrying loop or coil functions as an electromagnet. The direction of current flow determines the polarity of the magnetic field…
Correct answer: Behaves like the south pole