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Chapter 23: Q41PE (page 861)
What is the back emf of a \(120V\) motor that draws \(8.00A\) at its normal speed and \(20.0A\) when first starting?
The back emf value is \(72\;{\rm{V}}\).
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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 coil is moved through a magnetic field as shown in Figure 23.59. The field is uniform inside the rectangle and zero outside. What is the direction of the induced current and what is the direction of the magnetic force on the coil at each position shown.
A coil is moved into and out of a region of uniform magnetic field
The capacitor in Figure\(23.55\)(b) will filter high-frequency signals by shorting them to earth/ground. (a) What capacitance is needed to produce a reactance of\(10.0{\rm{ }}m\Omega \)for a\(5.00{\rm{ }}kHz\)signal? (b) What would its reactance be at\(3.00{\rm{ }}Hz\)? (c) Discuss the implications of your answers to (a) and (b).
A person who works with large magnets sometimes places her head inside a strong field. She reports feeling dizzy as she quickly turns her head. How might this be associated with induction?
Verify that the units of \({\rm{\Delta \Phi /\Delta t}}\) are volts. That is, show that \({\rm{1\;T \times }}{{\rm{m}}^{\rm{2}}}{\rm{/s = 1\;V}}\).
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