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Chapter 23: Q23.8-17CQ (page 858)
Does plastic insulation on live/hot wires prevent shock hazards, thermal hazards, or both?
Plastic is non conducting for both heat and electricity, meaning it prevents both shock and thermal hazards.
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At what frequency will a\(30.0\,{\rm{mH}}\)inductor have a reactance of\(100\,{\rm{\Omega }}\)?
Derive an expression for the current in a system like that in figure below, under the following conditions. The resistance between the rails is R , the rails and the moving rod are identical in cross section A and have the same resistivity 蟻. The distance between the rails is l, and the rod moves at constant speed v perpendicular to the uniform field B. At time zero, the moving rod is next to the resistance R.
(a) What is the characteristic time constant of a \(25.0{\rm{ }}mH\) inductor that has a resistance of\(4.00{\rm{ }}\Omega \)? (b) If it is connected to a \(12.0{\rm{ }}V\) battery, what is the current after \(12.5ms\)?
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?
How would you shape a given length of wire to give it the greatest self-inductance? The least?
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