4 ELECTRODYNAMICS
Now that you have learned separately about the electric and magnetic fields, it is time to learn about the effects that can be explained only by taking into account both the electric and magnetic field. In other words, it is time to learn about the interaction of the two fields.
CHANGING MAGNETIC FIELDS AND LENZ’S LAW
In Chapter 3 you learned about the magnetic field and how it stores energy. You may wonder where this magnetic field energy comes from. The energy of the magnetic field comes from the current that caused it. Consider a simple electric circuit where a power source supplies a resistor through some wire. When the power supply is turned on, the current in the circuit increases from zero to that defined by Ohm’s law, ...
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