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. Strong
- B. Infinite
- C. Negligible
- D. None of these
Explanation: Option A: Strong: This option is incorrect. The magnetic field outside a solenoid is generally weaker compared to the field inside the…
Correct answer: Negligible- A. qm/B
- B. m/qB
- C. qB/m
- D. qmB
Explanation: During circular motion in a magnetic field, the angular frequency (ω) is given by the formula:ω = qB/mwhere:ω is the angular frequency,q…
Correct answer: qB/m- A. Distance
- B. Current on them
- C. Charge on them
- D. None of these
Explanation: According to Formula of Magnetic Force between two wires,F= I1I2L2dF I1 I2 l F 12dF is directly proportional to Permeability, Current of…
Correct answer: Distance- A. Momentum
- B. Charge
- C. Current
- D. Energy
Explanation: Energy is the correct answer. Lenz's law is a fundamental principle in electromagnetism that describes the direction of an induced current…
Correct answer: Energy- A. Changes direction
- B. Changes strength
- C. Changes polarity
- D. No change occurs
Explanation: The correct answer is changes strength because magnetic flux is defined as the product of the magnetic field strength and the area through…
Correct answer: Changes strength- A. Tesla
- B. Wb/m2
- C. V-s/m2
- D. All
Explanation: The unit of magnetic flux density is Tesla (T). It is a derived unit in the International System of Units (SI) and represents the amount…
Correct answer: All- A. Conservative
- B. Non conservative
- C. Depends on internal property
- D. Not enough information
Explanation: The correct answer is Option B: Non-conservative. An electric field generated through induction is non-conservative because the work done…
Correct answer: Non conservative- A. Clockwise sense
- B. Anticlockwise sense
- C. Not generates
- D. Not enough information
Explanation: As the North Pole is moved towards the coil, the magnetic field increases in the direction of motion.
Correct answer: Anticlockwise sense- A. Becomes half
- B. Becomes twice
- C. Becomes infinite
- D. Becomes 4 times
Explanation: The magnetic flux through a closed loop is directly proportional to the magnetic field passing through the loop.
Correct answer: Becomes twice- A. Increases core loss
- B. Increases I2R loss
- C. Interference with communication circuits
- D. All of the above
Explanation: All of the above effects result from the presence of harmonics in transformers.
Correct answer: All of the above- A. No load
- B. Full load
- C. Half load
- D. Double load
Explanation: Power transformers are designed to achieve maximum efficiency at full load because this is the condition under which they typically…
Correct answer: Full load- A. Step up
- B. Step down
- C. Primary
- D. Secondary
Explanation: When Ns>Np in a transformer, it is a step-up transformer.Here's what these variables represent:Ns is the number of turns in the secondary…
Correct answer: Step up- A. Electromagnetic induction
- B. Kirchoff's law
- C. Hysteresis loss
- D. Lenz's law
Explanation: When the magnetic flux linked with an electric circuit changes, an electromotive force (emf) is induced in the circuit.
Correct answer: Electromagnetic induction- A. Electromotive force
- B. Induced current
- C. Induced flux
- D. Induced magnetic field
Explanation: Faraday's law of induction states that the rate of change of magnetic flux is equal to the induced electromotive force (EMF).
Correct answer: Electromotive force- A. More
- B. Less
- C. Equal
- D. Zero
Explanation: In a step-down transformer, the number of turns in the secondary coil is less than the number of turns in the primary coil.
Correct answer: Less- A. Electric field
- B. Magnetic field
- C. Both option A and B
- D. None of these
Explanation: An electric charge in uniform motion produces both electric and magnetic fields.A stationary electric charge produces only an electric…
Correct answer: Both option A and B- A. 4 wb
- B. 5 wb
- C. 6 wb
- D. 7 wb
Explanation: The flux (Φ) is given by the dot product of the magnetic field vector (B) and the area vector (A):Φ = B ⋅ AGiven that B = (i + 2j + k) and…
Correct answer: 5 wb- A. 150V
- B. 300V
- C. 100V
- D. 0V
Explanation: B= 5T ,l= 3m , v= 10m/sPUTTING VALUES ε=Blv ε=(5)(3)(10) ε=150V
Correct answer: 150V- A. 14.85
- B. 18.45
- C. 84.25
- D. 7.325
Explanation: I= 2.75A , L= 60cm , B= 9Force on a current carrying conductor is given by; F=ILBF=(2.75)(0.6)(9) (60cm=0.6m)F=14.85
Correct answer: 14.85- A. Magnetic
- B. Electric
- C. Static
- D. All of these options are correct
Explanation: The correct answer is Option B: Electric. An electric field is specifically defined as a region where a charge experiences a force.
Correct answer: Electric