Electricity and magnetism basics - One Line Questions

1. What is the relationship between SI and CGS units for charge? 1 Coulomb is approximately equal to: — 3 x 10^9 statcoulombs
2. In an AC circuit, what is the frequency of alternating current in India? — 50 Hz
3. What is the SI unit of electric charge? — Coulomb
4. What is the SI unit of electric potential difference (voltage)? — Volt
5. What is the unit of electric current in the CGS system? — Statampere
6. Which law states that the induced electromotive force (EMF) in any closed circuit is equal to the negative of the time rate of change of the magnetic flux through the circuit? — Faraday's Law of Induction
7. Lenz's Law is a consequence of the conservation of: — Energy
8. The formula for magnetic force on a moving charge is F = qvBsin(theta). What does 'B' represent? — Magnetic Field Strength
9. Magnetic field lines always form: — Closed loops
10. What is the property of a material that opposes the flow of electric current? — Resistance
11. What is a substance that does not allow electric current to flow through it easily called? — Insulator
12. Which of the following is a good insulator? — Glass
13. What is the SI unit of electric current? — Ampere
14. What is the unit of electric charge in the CGS system? — Statcoulomb
15. What happens to the resistance of a metallic conductor when its temperature increases? — Increases
16. What is the effect of increasing the number of turns in a solenoid on its magnetic field strength (assuming current is constant)? — Increases
17. What is the effect of increasing the current in a solenoid on its magnetic field strength (assuming number of turns is constant)? — Increases
18. What happens when a conductor moves through a magnetic field, or a magnetic field changes around a conductor? — Electric current is induced
19. What is the region around a magnet where its influence can be detected called? — Magnetic field
20. What is the force experienced by a charge moving in a magnetic field? — Magnetic Force
21. Which quantity is defined as the rate of flow of electric charge? — Electric Current
22. What is the phenomenon where an electric current in a wire creates a magnetic field around it? — Electromagnetism
23. What is the phenomenon where a changing electric field produces a magnetic field? — Displacement Current
24. What is the unit of inductance? — Henry
25. What does resistance oppose in an electrical circuit? — Flow of charge
26. What is the SI unit for magnetic field strength (or magnetic flux density)? — Tesla
27. Which device uses the principle of electromagnetic induction to convert electrical energy into mechanical energy? — Motor
28. What phenomenon is responsible for the attraction or repulsion between charged objects? — Electrostatic force
29. What is the basic principle behind magnetic resonance imaging (MRI)? — Nuclear Magnetic Resonance
30. What is the unit of capacitance? — Farad
31. What is a substance that allows electric current to flow through it easily called? — Conductor
32. Which scientist is credited with demonstrating the relationship between electricity and magnetism, leading to the theory of electromagnetism? — James Clerk Maxwell
33. What does Lenz's Law state about the direction of induced current? — It flows in the opposite direction to the change in magnetic flux that produced it.
34. What is the SI unit of electric power? — Watt
35. Which device converts mechanical energy into electrical energy using electromagnetic induction? — Generator
36. What is a device that uses the heating effect of electric current to produce light? — Incandescent bulb
37. Which law describes the heat produced in a resistor due to current flow? — Joule's Law
38. Like charges repel each other, and unlike charges attract each other. This is a statement of: — Coulomb's Law
39. The principle of electromagnetic induction is described by which law? — Faraday's Law
40. A temporary magnet made by passing an electric current through a coil of wire wrapped around an iron core is called an: — Electromagnet
41. Which of the following is a good conductor of electricity? — Aluminum
42. What are the two poles of a magnet called? — North and South
43. Which material typically has very low electrical resistance? — Copper
44. What is the SI unit of magnetic flux? — Weber
45. What is the primary function of a transformer? — To increase or decrease AC voltage
46. According to Ohm's Law, which of the following is true? — I = V/R
47. The formula for magnetic force on a moving charge is F = qvBsin(theta). What does 'q' represent? — Charge
48. What is the SI unit of electrical resistance? — Ohm
49. What is the SI unit of energy or work done? — Joule
50. What is the SI unit of magnetic flux density? — Tesla
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