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.
Last updated
Read the Electromagnetism notesFree MDCAT chapter notes with key terms1,176 questions · page 45 of 59
- A. Zero
- B. Non-zero and along a line connecting the wires
- C. Non-zero and parallel to the wires
- D. Non-zero and prependicular to the plane of the two wires
Explanation: At a point midway between the wires, themagnetic field they produce is: zero
Correct answer: Zero- A. 0
- B. 8.0 x 10^-4
- C. 4.0 x 10^-4
- D. 12 x 10^-4
Explanation: At midpoint between two wires carry current in the same direction B=B2-B1
Correct answer: 4.0 x 10^-4- A. Electron
- B. Proton
- C. Alpha particle
- D. All would have same deflection
Explanation: Most deflected means small radius me < Mp < Ma re <rp <ra Smaller the radius ,means greater will be the deflection.
Correct answer: Electron- A. 0
- B. 2.6 x 10^-14N
- C. 3.8 x 10^-14N
- D. 6.4 x 10^-14N
Explanation: For magnetic force only vertical component is responsible
Correct answer: 3.8 x 10^-14N- A. I/R
- B. R2
- C. R
- D. R3
Explanation: In a cyclotron, charged particles (such as electrons or ions) are accelerated by a magnetic field and an oscillating electric field.
Correct answer: R2- A. Straight ahead
- B. Clockwise around a circle in the xy plane
- C. Counterclockwise around a circle in the xy plane
- D. In the positive z direction
Explanation: F=e(VxB) As given v is in +ve x -direction B is in +ve z -direction By using right hand rule the magnetic force acts along the + y-axis.
Correct answer: Counterclockwise around a circle in the xy plane- A. A
- B. B
- C. C
- D. D
Explanation: For an infinitely long straight wire carrying current I, the magnitude of the magnetic field (B) at a distance "r" from the wire is…
Correct answer: D- A. V is parallel to t and has magnitude E/B
- B. V is parallel to B
- C. V is perpendicular to both E and B and has magnitude B/E
- D. V is perpendicular to both E and B and has magnitude E/B
Explanation: It is observed that the velocity nv of the electron is unaffected is that v is perpendicular to both E and B and has magnitude E/B
Correct answer: V is perpendicular to both E and B and has magnitude E/B- A. Zero
- B. Due to electric field
- C. Due to magnetic field
- D. Due to both fields
Explanation: When a charged particle enters a region where both electric and magnetic fields are parallel and oriented in the same direction, the force…
Correct answer: Due to electric field- A. Positive y
- B. Negative y
- C. Positive x
- D. Negative x
Explanation: F direction= = negative y- direction if electric field is applied in positive y-direction, then Fm = Fe (Fnet = 0)
Correct answer: Positive y- A. WbmA-1
- B. WbA-1m
- C. A-1Wbm-1
- D. No units
Explanation: The permeability of free space, denoted as µ₀, is a fundamental physical constant that describes how magnetic fields interact with the…
Correct answer: A-1Wbm-1- A. N-E
- B. E-W
- C. W-S
- D. N-S
Explanation: By right hand rule the direction of magnetic field is N-S.
Correct answer: N-S- A. Into the page
- B. Out of the page
- C. Left side of the page
- D. Right side of the page
Explanation: The correct answer is 'Into the page'. According to the right-hand rule, if you point your thumb in the direction of the current (which is…
Correct answer: Into the page- A. Bev
- B. Bev/2
- C. Infinite
- D. Zero
Explanation: Speed "v" is parallel to the direction of magnetic field so the angle will be 0 and sin(0) = 0 F = qvBsin0 = 0
Correct answer: Zero- A. Straight line
- B. Circle
- C. Parabola
- D. Helix
Explanation: FB = qvBsin0o = 0 So, proton will move along the straight lline.If the proton enters in the magnetic field in the direction of the field…
Correct answer: Straight line- A. Be halved
- B. Be doubled
- C. Becomes 4 time
- D. Not change
Explanation: The energy of charged particle moving in circular path in magnetic field is given by.
Correct answer: Becomes 4 time- A. Toward the top of the page
- B. Toward the left
- C. Toward the bottom of the page
- D. Toward the right
Explanation: F=(LxB) F direction= positive y- direction (toward the top of the page)Answer and Explanation:Next, curl your fingers in the direction of…
Correct answer: Toward the top of the page- A. ra>rb
- B. rb>ra
- C. ra=rb
- D. ra>>rb
Explanation: Explanation is given below:qvB = mv2/rqB= mv/rr = P/qB mv = P (momentum)
Correct answer: ra=rb- A. 0.24 x 10^-12N
- B. 2.4 x 10^-12N
- C. 24 x 10^-12N
- D. 0.024 x 10^-12N
Explanation: F=qvBsinθ , θ=30oVelocity of proton v=2×207m/sMagnetic field B=1.5Wb/m2Magnetic force acting on the proton F=qvBsinθ∴…
Correct answer: 2.4 x 10^-12N- A. N-S direction
- B. E-W direction
- C. N-E direction
- D. W-S direction
Explanation: The magnetic compass will point in N-S direction.Compass needles point in the N-S direction because the Earth itself is a magnet.
Correct answer: N-S direction