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Chapter 23: Q69PE (page 863)
If you want a characteristic RL time constant of 1.00 s, and you have a resistor , what value of self-inductance is needed?
The value of self-inductance is 500 H
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How do the multiple-loop coils and iron ring in the version of Faraday’s apparatus shown in Figure 23.3 enhance the observation of induced emf?
A precision laboratory resistor is made of a coil of wire \(1.50cm\) in diameter and \(4.00cm\) long, and it has \(500\) turns. (a) What is its self-inductance? (b) What average emf is induced if the \(12.0A\) current through it is turned on in \(5.00ms\) (one-fourth of a cycle for \(50Hz\) AC)? (c) What is its inductance if it is shortened to half its length and counter wound (two layers of \(250\) turns in opposite directions)?
Verify that the units of \({\rm{\Delta \Phi /\Delta t}}\) are volts. That is, show that \({\rm{1\;T \times }}{{\rm{m}}^{\rm{2}}}{\rm{/s = 1\;V}}\).
Suppose you have a supply of inductors ranging from \(1.00{\rm{ }}nH\) to\(10.0{\rm{ }}H\), and resistors ranging from \(0.100{\rm{ }}\Omega \) to\(1.00{\rm{ }}M\Omega \). What is the range of characteristic \(RL\) time constants you can produce by connecting a single resistor to a single inductor?
What value of inductance should be used if a\(20.0\,{\rm{k\Omega }}\)reactance is needed at a frequency of\(500\,{\rm{Hz}}\)?
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