Chapter 23: Q1E (page 860)
What is the value of the magnetic flux at coil 2 in figure due to coil 1?
The value of the magnetic flux at coil 2 is zero.
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An American traveller in New Zealand carries a transformer to convert New Zealand’s standard\(240{\rm{ }}V\)to\(120{\rm{ }}V\)so that she can use some small appliances on her trip. (a) What is the ratio of turns in the primary and secondary coils of her transformer?
(b) What is the ratio of input to output current?
(c) How could a New Zealander traveling in the United States use this same transformer to power her\(240{\rm{ }}V\)appliances from\(120{\rm{ }}V\)?
Suppose you have a supply of inductors ranging from 1.00 nHto 10.0 H, and capacitors ranging from 0.100 pFto 0.100 F. What is the range of resonant frequencies that can be achieved from combinations of a single inductor and a single capacitor?
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).
The lowest frequency in the FM radio band is 88.0 MHz. (a) What inductance is needed to produce this resonant frequency if it is connected to a 2.50pFcapacitor? (b) The capacitor is variable, to allow the resonant frequency to be adjusted to as high as 108 MHz. What must the capacitance be at this frequency?
What percentage of the final current \({\rm{I_0}}\) flows through an inductor \({\rm{L}}\) in series with a resistor\({\rm{R}}\), three-time constants after the circuit is completed?
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