Chapter 30: Inductance; and Electromagnetic Oscillations
Warm-Ups




1.  

Here's one way of understanding a capacitor: It is a device that won't let the voltage between two points change too rapidly, because it stores up charge and has V = Q/C. The charge cannot be changed instantaneously, so the voltage cannot either.

Please describe an inductor in a similar way, that is, say what cannot be changed rapidly and why.



2.  

Estimate the inductance of a solenoid made by buying a typical spool of wire from hardware store and winding it carefully around a broom handle.



3.  

A car battery has an emf of only 12 V, yet energy from the battery provides the 20,000 V spark that ignites the gasoline. How is this possible?



4.  

A spool of wire purchased at the hardware store has both a resistance and an inductance. Estimate both, and calculate the time constant for the combination.


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