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 54 of 59
- A. It will not move.
- B. At an acute angle with direction of current.
- C. Perpendicular to direction of current.
- D. In direction of current.
Explanation: The correct option is A It will not move. The direction of the force on a conductor placed in a magnetic field is given by Fleming's…
Correct answer: It will not move.- A. R
- B. I/R
- C. I/R2
- D. I/R3
Explanation: Explanation is given below: (L = circumference = 2(pi)r) B = 1/r
Correct answer: I/R- A. Toward the megnet
- B. Downward
- C. Away from the megnet
- D. Upward
Explanation: Option D is correct. If the motion of the current is near the north pole, the wire will be pushed upwards.
Correct answer: Upward- 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 positive y direction
Explanation: Magnetic Force(F)=q⋅(v×B) Where: q = charge of the particle = -1.6 x 10-19 C (Coulombs) v = velocity of the particle = 3 x 105 m/s in the…
Correct answer: 4 x 10^-14N in the positive y direction- A. Circular
- B. Parabolic
- C. Helix
- D. Hyparabolic
Explanation: When a charge particle enter in a magnetic field at a angle of 45o(any allele other than 90o) then its path in magnetic field will be…
Correct answer: Helix- A. WbmA-I
- B. WbA-Im
- C. A-1Wbm-1
- D. No units
Explanation: µ₀ is a constant, known as permeability of free space. In SI units its value is 4πx10-7 wb A-1m-1
Correct answer: A-1Wbm-1- A. Turn to the left
- B. Turns to the right
- C. Move with decreased velocity
- D. Move with the decrease velocity
Explanation: FB = qvBsin0o = 0 Fe = qE = 0 As the electron moves along the electric field.
Correct answer: Move with decreased velocity1068. The flux through an area of 1m2 in xy plane in a magnetic field of 1T directed along x-axis will be:
- A. Zero
- B. 0.5 wb
- C. 1 wb
- D. 2 wb
Explanation: ΦB=BA=(1)(1)=1Wb Here is a step-by-step solution: 1: The magnetic field is 1 T directed along x-axis. 2: The area is 1 m^2.
Correct answer: 1 wb- A. Normal at that point
- B. The tangent at that point
- C. Axis of the magnetic line of force at that point
- D. Can't be taken
Explanation: The direction of the magnetic field at any point along a magnetic line of force can be determined by drawing a tangent to the line at that…
Correct answer: The tangent at that point- A. 1T =103 G
- B. 1T =10-2 G
- C. 1T =10-4 G
- D. 1T =104 G
Explanation: Option D is correct.The relationship between Tesla (T) and smaller unit Gauss (G) of magnetic induction is given by: 1 T = 10^4 G 1 Tesla…
Correct answer: 1T =104 G- A. F=BIL
- B. F=BLsinθ/I
- C. F=I/BL sin0
- D. F=0
Explanation: The correct formula is F = BIL sinθ When a current-carrying conductor is parallel to the magnetic field the angle θ (that is the angle…
Correct answer: F=0- A. Zero
- B. 1/√2 x 10^-3 N
- C. 1/√2 N
- D. 5 x 10^-4 N
Explanation: First, convert Gauss into Tesla 1 gauss = 1x 10-4 T. F = BIL sinθ F = 1x10-4 x 1 x 1 sin45 = 1 x 1 x 10-4sin45°= 1/√2 x 10-3N
Correct answer: 1/√2 x 10^-3 N- A. Parallel
- B. Divergent
- C. Convergent
- D. None of these
Explanation: Lines of force in a uniform magnetic field are parallel to each other and equally spaced.
Correct answer: Parallel- A. Attract
- B. Repel
- C. Neither repel nor attract
- D. Data insufficient
Explanation: Two conductors show attraction. Both the conductors are marked with dots and the currents are both flowing toward the observer (i.e.
Correct answer: Attract- A. 90°
- B. 0°
- C. 120°
- D. 45°
Explanation: Option B is correct.The force on the conductor will be zero when there is magnetic field into the conductor.
Correct answer: 45°- A. Their time periods will be same
- B. The time period for electron will be higher
- C. The time period for proton will be higher
- D. Their orbital radii will be same
Explanation: Option B is correct We 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 proton will be higher- A. Circle
- B. Parabola
- C. Straight line
- D. Helical
Explanation: Option D is correct.A charged particle entering a uniform magnetic field with an angle of 60 degrees will follow a helical path.
Correct answer: Helical- A. Momentum
- B. Torque
- C. Force
- D. Impulse
Explanation: Option B) Torque is corrrect. A galvanometer is an instrument used for detecting and measuring electric current.
Correct answer: Torque- A. Resistance
- B. Conductance
- C. Reactance
- D. Angle of deflection
Explanation: In a galvanometer, the current passing through the coil is directly proportional to the angle of deflection of the pointer or needle.
Correct answer: Angle of deflection- A. Voltmeter
- B. Ammeter
- C. Ohmmeter
- D. Potentiometer
Explanation: A shunted galvanometer is typically referred to as an ammeter. An ammeter is an instrument used to measure electric current in a circuit.
Correct answer: Ammeter