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Chapter 4: Q15DQ (page 947)
Show that the unitsandfor the Bohr magneton are equivalent.
They are equivalent. .
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An emf source with E = 120 V, a resistor with R = 80.0 Ω, and a capacitor with C = 4.00 µF are connected in series. As the capacitor charges, when the current in the resistor is 0.900 A, what is the magnitude of the charge on each plate of the capacitor?
Electric eels generate electric pulses along their skin that can be used to stun an enemy when they come into contact with it. Tests have shown that these pulses can be up to and produce currents of (or even larger). A typical pulse lasts for . What power and how much energy are delivered to the unfortunate enemy with a single pulse, assuming a steady current?
The heating element of an electric dryer is rated at 4.1 kW when connected to a 240-V line. (a) What is the current in the heating element? Is 12-gauge wire large enough to supply this current? (b) What is the resistance of the dryer’s heating element at its operating temperature? (c) At 11 cents per kWh, how much does it cost per hour to operate the dryer?
The energy that can be extracted from a storage battery is always less than the energy that goes into it while it is being charged. Why?
An electron at pointinFig. E27.15has a speedofFind (a) the magnitude and direction of the magnetic field that will cause the electron to follow the semicircular path fromto, and (b) the time required for the electron to move fromto.
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