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 9 of 59
- A. Translucent
- B. Mass scale
- C. Transparent
- D. None of these
Explanation: Translucent materials allow some light to pass through, but they also scatter or diffuse the light, making objects on the other side…
Correct answer: Translucent- A. Bearings
- B. Jewels
- C. Jewelled bearings
- D. All are correct
Explanation: Jewelled bearings are bearings that incorporate jewel materials, such as synthetic sapphires or rubies, as bearing surfaces.
Correct answer: Jewelled bearings- A. Stable galvanometer
- B. Sensitive galvanometer
- C. Both (a) and (b)
- D. None of these
Explanation: A sensitive galvanometer is designed to detect and respond to small electrical currents with high sensitivity and precision.
Correct answer: Sensitive galvanometer- A. Voltmeter
- B. Ohmmeter
- C. Ammeter
- D. All of above
Explanation: This option suggests that a moving coil galvanometer can be converted into a voltmeter, ohmmeter, and ammeter by appropriately connecting…
Correct answer: All of above- A. A multi meter
- B. An ammeter
- C. An ohmmeter
- D. None of these
Explanation: An AVO meter is indeed commonly referred to as a multimeter. A multimeter is a versatile electronic instrument that combines several…
Correct answer: A multi meter- A. Shunt resistance
- B. Low value parallel
- C. Low value by pass resistor
- D. All of above
Explanation: A bypass resistor, similar to a shunt resistor, provides an alternative path (bypass) for the main current to flow, effectively diverting…
Correct answer: Low value by pass resistor- A. Shunt resistance
- B. A high value series resistance
- C. Parallel resistance
- D. None of these
Explanation: To convert a galvanometer into a voltmeter, a high-value resistor is connected in series with the galvanometer.
Correct answer: A high value series resistance- A. Very large
- B. Very small
- C. Both (a) and (b)
- D. None of these
Explanation: The resistance of a shunt resistor used in an ammeter is very small. Typically, the shunt resistor has a much lower resistance compared to…
Correct answer: Very small- A. Potential difference in volt
- B. Current in Ampere
- C. Resistance in ohms
- D. All of above
Explanation: An AVO meter, being a versatile instrument, is capable of measuring potential difference (voltage) in volts, current in amperes, and…
Correct answer: All of above- A. Center of the scale
- B. Left end of the scale
- C. Right end of the scale
- D. None of these
Explanation: When the ohmmeter measures infinite resistance, indicating an open circuit condition, the pointer moves to the right end of the scale.
Correct answer: Left end of the scale- A. Voltmeter
- B. Ammeter
- C. Ohmmeter
- D. None of these
Explanation: When a high resistance is connected in series with a galvanometer, it forms a voltmeter.
Correct answer: Voltmeter- A. Repel each other
- B. Attract each other
- C. No effect on each other
- D. None of these
Explanation: According to the right-hand rule, the magnetic field produced by one wire will form concentric circles around the wire, and the magnetic…
Correct answer: Repel each other- A. α-particle
- B. β-particle
- C. Neutrons
- D. None of these
Explanation: Neutrons are neutral particles with no electric charge. As a result, they do not experience a force when moving through a magnetic field.
Correct answer: Neutrons- A. Upward
- B. Downward
- C. No deflection
- D. None of these
Explanation: When an electron enters a magnetic field at a right angle from the left and the magnetic field B is directed into the paper, the electron…
Correct answer: Downward- A. Area of coil
- B. Magnetic field
- C. Number of turns of coil
- D. Torsional constant
Explanation: The sensitivity of a galvanometer is inversely proportional to the strength of the magnetic field in which it operates.
Correct answer: Magnetic field- A. **F must be perpendicular to v but not necessarily to B**
- B. **v must be perpendicular to B but not necessarily to F**
- C. **F must be perpendicular to both v and B**
- D. All three vectors must be mutually perpendicular
Explanation: Understanding the Formula F = q(v × B)The formula \( F = q(v \times B) \) represents the force \( F \) experienced by a charged particle…
Correct answer: **F must be perpendicular to both v and B**- A. F = I/B
- B. F = 1/B sin(theta)
- C. F = 0
- D. F = 1/B cos(theta)
Explanation: None of the options provided accurately describe the magnetic force experienced by a current-carrying conductor in a uniform magnetic…
Correct answer: F = 1/B cos(theta)- A. 1A
- B. 10A
- C. 100A
- D. 1000A
Explanation: Determining Current in a Wire at Right Angle to a Magnetic Field Given Information:- Length of the wire (\( L \)) = 10 cm = 0.1 m-…
Correct answer: 100A- A. \( T = \frac{2\pi q}{Bm} \)
- B. \( T = \frac{2\pi m}{qB} \)
- C. \( T = \frac{2\pi B}{qm} \)
- D. \( T = \frac{qB}{2\pi m} \)
Explanation: ### Calculating Time for a Charged Particle to Complete a Revolution in a Magnetic FieldGiven:- Charge of the particle (\( q \))- Mass of…
Correct answer: \( T = \frac{2\pi m}{qB} \)- A. in the negative z direction
- B. in the positive z direction
- C. in the negative y direction
- D. in the positive y direction
Explanation: The magnetic force (F) on a charged particle moving through a magnetic field is given by the equation:\[ F = q \times (v \times B)…
Correct answer: in the negative z direction