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Chapter 23: Q79PE (page 863)
At what frequency will a\(30.0\,{\rm{mH}}\)inductor have a reactance of\(100\,{\rm{\Omega }}\)?
The frequency is, \(530.52\,{\rm{Hz}}\).
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How do the multiple-loop coils and iron ring in the version of Faraday鈥檚 apparatus shown in Figure 23.3 enhance the observation of induced emf?
An RC circuit consists of a\(40.0{\rm{ }}\Omega \)resistor and a\(5.00{\rm{ }}\mu F\)capacitor.
(a) Find its impedance at\(60.0{\rm{ }}Hz\)and\(10.0{\rm{ }}kHz\).
(b) Compare these values of\(Z\)with those found in Example\(23.12\), in which there was also an inductor.
The335 kV AC electricity from a power transmission line is fed into the primary coil of a transformer. The ratio of the number of turns in the secondary to the number in the primary is. (a) What voltage is induced in the secondary? (b) What is unreasonable about this result? (c) Which assumption or premise is responsible?
The capacitor in Figure \(23.55\) (a) is designed to filter low-frequency signals, impeding their transmission between circuits. (a) What capacitance is needed to produce a \(100{\rm{ }}k\Omega \) reactance at a frequency of \(120{\rm{ }}Hz\)? (b) What would its reactance be at \(1.00{\rm{ }}mHz\)? (c) Discuss the implications of your answers to (a) and (b).
(a) A nonferrous screwdriver is being used in a 2.00 Tmagnetic field. What maximum emf can be induced along its 12.0 cmlength when it moves at 6.00 m/s? (b) Is it likely that this emf will have any consequences or even be noticed?
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