Inductance CHAPTER OUTLINE 32.1 Self-Inductance 32.3 Energy in a Magnetic Field Chapter 32.

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Presentation transcript:

Inductance CHAPTER OUTLINE 32.1 Self-Inductance 32.3 Energy in a Magnetic Field Chapter 32

32.1 Self-Inductance

The SI unit of inductance is the henry (H),

Example 32.1 Inductance of a Solenoid

Example 32.2 Calculating Inductance and emf

32.3 Energy in a Magnetic Field Because the emf induced in an inductor prevents a battery from establishing an instantaneous current, the battery must provide more energy than in a circuit without the inductor. Part of the energy supplied by the battery appears as internal energy in the resistor, while the remaining energy is stored in the magnetic field of the inductor we can write the rate dU/dt at which energy is stored as

The energy density of a magnetic field for a solenoid

The magnetic field of a solenoid The magnetic energy density, or the energy stored per unit volume in the magnetic field of the inductor is

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