Free Electromagnetic Induction MCQs with Answers
288 Electromagnetic Induction MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Changing magnetic flux induces an emf according to Faraday's law, while Lenz's law gives the direction that opposes the change producing it. Transformers apply induction between coils to step alternating voltage up or down, with turns ratio, current transformation and energy losses determining practical operation.
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Read the Electromagnetic Induction notesFree MDCAT chapter notes with key terms288 questions · page 10 of 15
181. A dynamo converts:
- A. Electrical energy into mechanical energy
- B. Mechanical energy into electrical energy
- C. Magnetic energy into electrical energy
- D. None of these
Explanation: Explanation for this question will be added soon!
Correct answer: Mechanical energy into electrical energy- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Explanation for this question will be added soon!
Correct answer: Option C- A. Slip
- B. Split
- C. Both (a), (b)
- D. None of these
Explanation: Explanation for this question will be added soon!
Correct answer: Split- A. Joule
- B. Watt
- C. Newton
- D. Henry
Explanation: Both Wb*A/m and Newton have same SI Units i.e., Kgms-2
Correct answer: Newton- A. magnitude of charge q
- B. speed of the moving charge v
- C. magnitude of magnetic field B
- D. all of these
- E. none of these
Explanation: The force experienced by a charge moving in a magnetic field is given by the formula F = qvB sin(θ), where q is the charge, v is the…
Correct answer: all of these- A. The force acts radially inwards
- B. The force acts radially outwards
- C. The force acts in the direction of motion
- D. No force acts
Explanation: The question states along the axis of a solenoid. This implies that the Magnetic feild is parallel to the direction of current (For…
Correct answer: No force acts- A. Varying with radial distance
- B. Uniform
- C. Zero
- D. Not enough Information
Explanation: The magnetic field inside a long straight solenoid-carrying current is the same at all points.
Correct answer: Uniform- A. 30
- B. 40
- C. 50
- D. 60
Explanation: The frequency of an AC generator is 50 times per second.Hence, the current reverses its direction 50 times.
Correct answer: 50- A. 1.67 x 10^-4 T
- B. 3.67 x 10^-4 T
- C. 5.67 x 10^-4 T
- D. 7.67 x 10^-4 T
- E. 9.67 x 10^-4 T
Explanation: Given, a=3cm=9×10−2m, I=25AB=μoI/2πa=4π×10−7×25/2π×3×10−2=1.67 x 10-4 T
Correct answer: 1.67 x 10^-4 T- A. 0
- B. 4 x 10^-14N in the negative z direction
- C. 4 x 10^-14N in the positive z direction
- D. 4 x 10^-14N in the negative y direction
Explanation: Magnetic force is given byF = BqVF = 0.8 x 1.6x10-19 x 3x105F = 3.84x10-14 round it of to 4x10-14 NUse Fleming's left-hand rule to…
Correct answer: 4 x 10^-14N in the negative y direction- A. Turn to the left
- B. Turn to the right
- C. Move with decreased velocity
- D. Move with the same velocity
Explanation: FB = qvBsin0o = 0 Fe = qE = 0 As the electron moves along the electric field.
Correct answer: Move with decreased velocity- A. 2
- B. 1/2
- C. 1
- D. 4
Explanation: The radius of a charged particle's path in a magnetic field is given by the formula r = (mv) / (qB), where m is the mass, v is the…
Correct answer: 2- A. Their time periods will be the same
- B. The time period for the electron will be higher
- C. The time period for the proton will be higher
- D. Their orbital radii will be the same
Explanation: Option B is correctWe know that period T= qB/2πm i.e., T∝m (Since q and B are same) ∵ Mass of proton > Mass of electron ∴ Time period of…
Correct answer: The time period for the proton will be higher- A. Go on moving in the same direction with increasing velocity
- B. Go on moving in the same direction with constant velocity
- C. Turn to its right
- D. Turn to its left
Explanation: The proton will continue to move in the same direction as the initial velocity (parallel to the electric field), and its speed will…
Correct answer: Go on moving in the same direction with increasing velocity- A. 0.1 cm
- B. 1 m
- C. 10 cm
- D. None of these
Explanation: The radius of the circle described by a charged particle moving perpendicular to a magnetic field is given by the formula:r = mv/(qB)…
Correct answer: 1 m- A. Force and velocity of charge
- B. Force and magnetic field
- C. Current and force
- D. Current and magnetic field
Explanation: Ampere's law is a fundamental law in electromagnetism that relates the circulation of the magnetic field around a closed loop to the…
Correct answer: Current and magnetic field- A. Zero
- B. F-q
- C. F = qvB
- D. F = ILBsinθ
Explanation: Option A) zero is correct. A stationary charged particle in a uniform magnetic field experiences no magnetic force.
Correct answer: Zero- A. 2 fields
- B. 4 fields
- C. 3 fields
- D. None of these
Explanation: A moving charge, or an electric charge in motion, generates two types of fields:1.
Correct answer: 2 fields- A. 1 x 10^-6N
- B. 6.4 x 10^-17N
- C. 6.4 x 10^17N
- D. 4 x 10^6N
Explanation: To calculate the magnitude of the magnetic force experienced by an electron moving perpendicular to a magnetic field, you can use the…
Correct answer: 6.4 x 10^-17N- A. Electric motor
- B. A.C generator
- C. Transformer
- D. Transistor
Explanation: Transformer works on the principle of mutual induction betwen the two coils.
Correct answer: Transformer