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# Download Study Guide - Chapter 33-1

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Induction of Magnetic Fields Study Guide for Section 33.1 Just as a changing magnetic field can induce an electric field, a changing electric field can induce a magnetic field. This induced field obeys the following equation: * closed B † . L œ .! %! . FI .> loop This equation is similar to Ampère's law, except that %! . FI has been substituted in for the .> current. This quantity is known as displacement current: M. œ % ! . FI .> Displacement current is measured in amps (A), just like real current. However, displacement current is not actual current, it is just a changing electric field. We only think of it as current because it produces the same sort of magnetic field. For example, the magnetic field at a distance < from a displacement current M. is given by the formula F œ .! M. #1 < This section pays particular attention to the displacement current between the two plates of a capacitor. The primary thing to know about this is that the displacement current between the plates of a capacitor is equal to the current into and out of the capacitor. Problems: Chapter 33 # 3, 78 Answers: 78. M. œ #% A; F œ $# µT