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 53 of 59
- A. Is directed clockwise
- B. Does not appear
- C. Is directed counterclockwise
- D. Is alternating
Explanation: Wire is same so Perimeter of square = Perimeter of circle4L = 2πRR = 2L/πArea of square = L2Area of circle = πR2 = π(2L/π)2= 4L2/π= 1.3…
Correct answer: Is directed clockwise- A. Number of turns
- B. Area of coil
- C. Current and magnetic field
- D. All of above
Explanation: The torque experienced by a coil in a magnetic field can be increased by increasing any or all of the following factors: a) Number of…
Correct answer: All of above- A. NBA/ω
- B. NBAω
- C. NBA/ω 2
- D. NBAω2
Explanation: The flux linking with the coil at any instant t is given as: Φ = NBA cos ωt ∴ E= -dΦ/dt = NBAω sinωt Therefore, the maximum value of emf…
Correct answer: NBAω- A. 56.7 V/m
- B. 62.6 V/m
- C. 39.3 V/m
- D. 47.5 V/m
Explanation: Following is the solution to this question:
Correct answer: 62.6 V/m- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option C- A. 20 x 10^3 wb/m2
- B. 1.28 wb/m2
- C. 5 x 10^-5 wb/m2
- D. 0.8 wb/m2
Explanation: µ = 8 × 10-3, H = 160 B = µH = 1.28 wb/m2
Correct answer: 1.28 wb/m2- A. Diamagnetism
- B. Paramagnetism
- C. Feromagnetism
- D. None of these
Explanation: Paramagnetism depends upon temperature. Above the Curie temperature, the material becomes paramagnetic.
Correct answer: Paramagnetism- A. 450 K
- B. 200 K
- C. 375 K
- D. None of these
Explanation: Following is the solution to this question:
Correct answer: 200 K- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Following is the solution to this question:
Correct answer: Option B- A. 0.6, 0.06 W
- B. 0.06, 0.6 W
- C. 0.6, 4.8 W
- D. 4.8, 0.6 W
Explanation: Following is the solution to this question:
Correct answer: 0.6, 4.8 W- A. 5 A
- B. 2.4 A
- C. 2.0 A
- D. 10 A
Explanation: Following is the solution to this question:
Correct answer: 5 A- A. 2A
- B. 2.4 A
- C. Zero
- D. 1.7 A
Explanation: Given XL=XC=5Ω this is the condition of resonance. So VL=VC so net voltage across L and C combination will be zero.
Correct answer: Zero- A. helix
- B. A circle
- C. Straight line
- D. Ellipse
Explanation: B. When a charged particle enters a magnetic field perpendicular to the field lines, the path it follows is circular.
Correct answer: A circle- A. Away from you
- B. Clockwise
- C. Towards you
- D. Anti-clockwise
Explanation: A current carrying conductor carries current away from you the direction of magnetic field with respect to you is clockwise by using right…
Correct answer: Clockwise- A. Into the paper
- B. Towards the N pole of the magnet
- C. Out of the paper
- D. Towards the S pole of the magnet
Explanation: F=I(LxB) The direction of L is in the direction of the current. The direction of the magnetic force F is the right angle to the plane…
Correct answer: Into the paper- A. Speed C .
- B. Direction of motion
- C. Energy
- D. All of these
Explanation: Magnetic force is simply a deflecting force. It will change the direction of charge particle moving in magnetic field.
Correct answer: Direction of motion- A. rœm
- B. rœB
- C. rœI/v
- D. rœI/m
Explanation: The magnetic force provides the necessary centripetal force "F," to the electrons, each having mass "m".
Correct answer: rœm1058. 1 tesla is equal to:
- A. I NAm-1
- B. I NA-1m-1
- C. I NA-1m
- D. I N-lAm
Explanation: It is independent to area of cross section (radius) of solenoid. The Tesla unit has, for example, a corresponding validity in the SI…
Correct answer: I NA-1m-1- A. 1,2,3
- B. 2,3,1
- C. 2,1,3
- D. 3,2,1
Explanation: Explanation is given below: image 1: net B = B + B = 2B (both in the same direction) image 2: net B = B + (-B) = 0 (both in opposite…
Correct answer: 2,3,11060. In the formula F=q(vxB):
- A. F must be perpendicular to V but not necessarily to B
- B. F must be perpendicular to /3. but not necessarily to V
- C. V must be perpendicular to 173. but not necessarily toF
- D. F must be perpendicular to bp th V and B
Explanation: F=e(VxB) F = qv × B. The force F is perpendicular to the direction of the magnetic field B.
Correct answer: F must be perpendicular to bp th V and B