What is inductance and how does it work? This is a question that many people have, but don't know where to find the answer. In this post, we will discuss inductance and its effects on electronics. We will also provide a few examples of inductance in action. By the end of this post, you will have a better understanding of inductance and how it affects your everyday life!

Inductance is a property of an electronic circuit that opposes changes in current. It is measured in henries (H). The unit of inductance was named after Joseph Henry, who discovered inductance while investigating the nature of electricity.

Inductance occurs when there is a change in the magnetic field around a conductor. This changing magnetic field inducts or "creates" a voltage in the conductor. The magnitude of this voltage is proportional to the rate of change of the magnetic field and is given by the equation:

**V = L di/dt**

where V is the voltage, L is the inductance, and di/dt is the rate of change of current.

The inductance of a circuit is typically created by the presence of inductors. Inductors are devices that have inductance, which is used to oppose changes in current. They are made of a conductor (usually a coil of wire) that surrounds a magnetic material (such as iron). The inductance of an inductor is proportional to the number of turns in the coil and the area of the coil.

Inductors are used in a variety of electronic devices, including radios, TVs, computers, and cell phones. They are also used in power supplies and inductive charging systems.

The inductance of a circuit can also be affected by the presence of other inductors in the vicinity. This is called inductive coupling. Inductive coupling occurs when the magnetic field of one inductor induces a voltage in another inductor. The amount of inductive coupling between two inductors is proportional to the amount of inductance in each inductor and the distance between them.

Following are some of the multiple choice questions on the **Inductance** with answers that will help the students in developing their knowledge.

## Inductance MCQ

### 1. Which of the following are units for inductance?I. HenryII. Joules/(Ampere)2III. Volt . second/Ampere

### 2. Which of the following is the total series capacitive reactance formula?

### 3. A 10-turn ideal solenoid has an inductance of 3.5 mH. When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:

### 4. Which component opposes any change in current?

### 5. An airplane with a wingspan of 60.0 m flies parallel to the Earth’s surface at a point where the downward component of the Earth's magnetic field is 0.400 x l0-4 T. If the induced potential between wingtips is 0.900 V, what is the plane’s speed?

### 6. A time-delay relay that uses an RC timing circuit is called a(n)_________

### 7. 1 Henry is equivalent to

### 8. Which of the following factors DOES NOT affect the self inductance of a coil?

### 9. A 10-turn ideal solenoid has an inductance of 4.0 mH. To generate an emf of 2.0 V the current should change at a rate of:

### 10. Which of the following has the largest inductance?

### 11. Which of the following is not the unit for magnetic field strength?

### 12. Which of the following is not an example of an electromagnetic device?

### 13. Determine the factors which will not increases the induce emf of a coil

### 14. In order to induce a voltage across a coil ____.

### 15. Lenz's law states that the induced voltage across an inductor ____.

### 16. The voltage induced across an inductor is inversely proportional to the rate of change of magnetic flux.

### 17. A 7.2 mH inductor is connected to a current source. What is the magnitude of the voltage in the inductor at time 𝑡 = 3.0 𝑠 if the current is 𝐼(𝑡) = 5.0 + 7.0𝑡 − 2.0𝑡^2?

### 18. A 5.6 mH inductor is connected to a current source.What is the magnitude of the voltage in the inductorat time 𝑡 = 4.0 𝑠 if the current is 𝐼(𝑡) = 10.0 + 9.0𝑡 −3.0𝑡^2?

### 19. What is the total voltage of six 1.5 V cells, connected in series?

### 20. The total inductance value of two inductors 10H and 15H of connected in series is…

### 21. In an electric DC power supply, a capacitor is commonly used to__________

### 22. How power rating is specified for transformers?

### 23. A coil that opposes any change in current flow is called a(n) __________

### 24. One of the effects a capacitor has in a DC circuit is that it will __________.

### 25. The formula for calculating total parallel capacitance is __________

### 26. A common inductor found in fluorescent light fixtures is a __________

### 27. Which of the following is a type of capacitor?

### 28. The concept of a magnetic field being formed around a conductor when current flows through it is called __________.

### 29. Inductance is measured in __________.

### 30. __________ affects a DC circuit only when the current is first turned on, turned off, or when there is a charge in the load resistance.

### 31. The resistance provided by an inductor in an AC circuit is called __________.

### 32. Which of the following is the correct formula for calculating total series inductance?

### 33. Which of the following is the correct formula for calculating total parallel inductive reactance in a parallel circuit?

### 34. The energy stored by a capacitor is called a(n) __________.

### 35. Capacitance is measured in __________.

### 36. The trimmer capacitor is used for..

### 37. Which value is equal to one picofarad?

### 38. Which property of the capacitor stores electrical energy in electrostatic field?

### 39. Which unit is used to measure capacitance value?

### 40. What is the lowest voltage level of discharging the lead-acid battery?

### 41. What is the percentage of sulphuric acid in electrolyte used for lead-acid batteries?

### 42. Which energy is converted by the battery to produce electricity?

### 43. A long narrow solenoid has length ℓ and a total of N turns, each of which has cross-sectional area A. Its inductance is:

### 44. How much energy is stored in a long solenoid with 660 turns, length 𝐿 = 3.2 𝑚, and cross sectional area 𝐴 = 121 𝑐𝑚^2, when the current in it is 𝐼 = 85 𝐴?

### 45. How large a current must flow through a 1.2 H inductance so that the energy stored is 393 J?

### 46. Energy can be stored in many ways. What is theprimary energy storage form of an inductor?

### 47. A straight wire of length is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. Which end of the rod is positively charged?

### 48. A bar magnet is falling through a loop of wire with constant velocity. The south pole enters first. As the magnet leaves the wire, the induced current (as viewed from above) is:

### 49. According to Lenz’s law the direction of an induced current in a conductor will be that which tends to produce which of the following effects?

### 50. A metal rod is falling toward the surface of the Earth near the equator. As it falls, one end of the rod becomes positively charged due to the motional emf of the rod through the Earth's magnetic field. The rod is oriented so that:

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