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 46 of 59
- A. Tesla
- B. Joule
- C. Weber
- D. Newton
Explanation: The correct answer is Weber, which is defined as the amount of magnetic flux that passes through a surface area of one square meter in a…
Correct answer: Weber- A. 1.6 tesla
- B. 0.8 tesla
- C. 0.2 tesla
- D. 0.1 tesla
Explanation: So, when distance becomes double "B" will reduce to half.
Correct answer: 0.2 tesla- A. Electric field applied in the direction or motion
- B. Magnetic field applied in the direction of motion
- C. Electric field applied perpendicular to the direction of motion
- D. Magnetic field applied perpendicular to the direction of motion
Explanation: As the magnetic field is applied in the direction of motion it will not affect motion because both are parallel to each other.
Correct answer: Magnetic field applied in the direction of motion- A. A
- B. B
- C. C
- D. D
Explanation: When the direction of the current in two parallel wires are same then force of attraction will produce due to a weak magnetic field…
Correct answer: C- A. I A from R to S
- B. 2 A from R to S
- C. I A from S to R
- D. 2 A form S to R
Explanation: According to the right-hand rule direction of the current is from S to R.
Correct answer: I A from S to R- A. Nature of the material of the conducting wire
- B. Area of the conducting wire
- C. Amount of the current
- D. Direction of the current
Explanation: The direction of the magnetic lines of force can be found using the right-hand rule.
Correct answer: Direction of the current- A. R
- B. P
- C. Q
- D. S
Explanation: Using Fleming's left-hand rule, when the index finger is pointed in the direction of the magnetic field (North to South), while the second…
Correct answer: R- A. Right hand rule
- B. Henry's law
- C. Left hand rule
- D. Faraday's law
Explanation: The right-hand rule is specifically designed to find the direction of the magnetic field created by a current-carrying wire.
Correct answer: Right hand rule- A. Zero
- B. 1/√2 x 10^-4 N
- C. 1/√2 N
- D. 5 x 10^-4 N
Explanation: To find the force acting on a conductor in a magnetic field, we use the formula: F = BIL sin(θ).
Correct answer: 1/√2 x 10^-4 N- A. μoI/2r
- B. μoI/ϗr
- C. μoI/2ϗr
- D. Zero
Explanation: If we have two wires, the magnetic field created by the first wire will equal the magnetic field created by the second wire.
Correct answer: Zero- A. Stronger to a weaker field
- B. Remains stationary
- C. Weak to strong if the current is large
- D. All of these
Explanation: A current-carrying conductor placed in a magnetic field will move from a region of stronger to a weaker field.
Correct answer: Stronger to a weaker field- A. 75 x 10^7T
- B. 60 x 10^4T
- C. 4πx10-3T
- D. 750π x103T
Explanation: The magnetic field inside a solenoid can be calculated using the formula:B = µ0 x n x Iwhereµ0 = permittivity of free space = 4πx10-7I =…
Correct answer: 4πx10-3T- A. 1.2N
- B. 3.2N
- C. 2.5N
- D. 3/√ 2N
Explanation: Using the formula F = BIL sinθ Where, B = Magnetic field strength = 0.15T I = Current = 10A L = Length of the conductor = 2m θ = Angle…
Correct answer: 3/√ 2N- A. Weber/metre2
- B. Weber/ampere-metre
- C. Weber/metre
- D. Weber
Explanation: Option A is correct. The unit of magnetic induction is Tesla or Weber per metre2.
Correct answer: Weber/metre2- A. 100A
- B. Zero
- C. 10A
- D. 1A
Explanation: Option D is correct.The current flowing in the wire is: I = 1A Here's the explanation: The magnetic force on a current-carrying conductor…
Correct answer: 1A- A. East
- B. West
- C. North
- D. South
Explanation: Option A is correctProton will represent the direction of current. So, the direction of current is vertically downward.
Correct answer: East- A. F must be perpendicular to v but not necessarily to B
- B. V must be perpendicular to B but not necessarily to B
- C. F must be perpendicular to both v and B
- D. All three vectors must be mutually perpendicula
Explanation: Option B is correct.In vector product, all three vectors are mutually perpendicular.
Correct answer: F must be perpendicular to both v and B- A. Continue to move due east
- B. Move in a circular orbit with its speed unchanged
- C. Move in a circular orbit with its speed increases
- D. Get deflected vertically upwards
Explanation: Option B is correct.According to F=q(vxB) In perpendicular magnetic field, the path of a charged particle is a circle, and the magnetic…
Correct answer: Move in a circular orbit with its speed unchanged- A. Electron move in the direction of field
- B. Electron move opposite to field
- C. Electron start spinning
- D. Electron remain stationary
Explanation: Option D is correct. A stationary electron will remain stationary in a strong magnetic field.
Correct answer: Electron remain stationary- A. 0o
- B. 90o
- C. 45o
- D. 120o
Explanation: Option A is correct.The magnitude of force on a moving charge is zero when the angle between the velocity of the charge carrier and the…
Correct answer: 0o