Chapter 23: Q72PE (page 863)
Verify that after a time of \(10.0{\rm{ }}ms\), the current for the situation considered in Example \(23.9\) will be \(0.183{\rm{ }}A\) as stated.
Short Answer
The current\(0.183\)will be\(0.183A\)as stated.
Chapter 23: Q72PE (page 863)
Verify that after a time of \(10.0{\rm{ }}ms\), the current for the situation considered in Example \(23.9\) will be \(0.183{\rm{ }}A\) as stated.
The current\(0.183\)will be\(0.183A\)as stated.
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Get started for freeA \(500\)-turn coil with a\(0.250{\rm{ }}{m^2}\)area is spun in the Earthโs \(5.00 \times {10^{ - 5}}{\rm{ }}T\) field, producing a \(12.0{\rm{ }}kV\) maximum emf.
(a) At what angular velocity must the coil be spun?
(b) What is unreasonable about this result?
(c) Which assumption or premise is responsible?
(a) Use the exact exponential treatment to find how much time is required to bring the current through an\({\rm{80}}{\rm{.0 mH}}\)inductor in series with a\({\rm{15}}{\rm{.0 \Omega }}\)resistor to\({\rm{99}}{\rm{.0\% }}\)of its final value, starting from zero. (b) Compare your answer to the approximate treatment using integral numbers of\({\rm{\tau }}\). (c) Discuss how significant the difference is.
(a) The plug-in transformer for a laptop computer puts out \(7.50V\) and can supply a maximum current of \(2.00A\). What is the maximum input current if the input voltage is \(240V\)? Assume \(100\% \) efficiency. (b) If the actual efficiency is less than \(100\% \), would the input current need to be greater or smaller? Explain.
The 12.0 cm long rod in Figure 23.11moves at 4.00 m/s. What is the strength of the magnetic field if a 95.0 Vemf is induced?
This problem refers to the bicycle generator considered in the previous problem. It is driven by a \({\rm{1}}{\rm{.60 cm}}\) diameter wheel that rolls on the outside rim of the bicycle tire. (a) What is the velocity of the bicycle if the generatorโs angular velocity is \({\rm{1875 rad/s}}\)? (b) What is the maximum emf of the generator when the bicycle moves at \({\rm{10}}{\rm{.0 m/s}}\), noting that it was \({\rm{18}}{\rm{.0 V}}\) under the original conditions? (c) If the sophisticated generator can vary its own magnetic field, what field strength will it need at \({\rm{5}}{\rm{.00 m/s}}\) to produce a \({\rm{9}}{\rm{.00 V}}\) maximum emf?
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