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Chapter 4: Q17DQ (page 841)
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?
The battery has its own internal resistance, there is always energy dissipation during charging due to its internal resistance.
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An 18-gauge copper wire (diameter 1.02 mm) carries a current
with a current density of . The density of free electrons for
copper iselectrons per cubic meter. Calculate (a) the current in
the wire and (b) the drift velocity of electrons in the wire.
Two coils are wound around the same cylindrical form. When the current in the first coil is decreasing at a rate of , the induced emf in the second coil has magnitude . (a) What is the mutual inductance of the pair of coils? (b) If the second coil has 25 turns, what is the flux through each turn when the current in the first coil equals ? (c) If the current in the second coil increases at a rate of , what is the magnitude of the induced emf in the first coil?
Question: In the circuit shown in Fig. E26.47 each capacitor initially has a charge of magnitude 3.50 nC on its plates. After the switch S is closed, what will be the current in the circuit at the instant that the capacitors have lost 80.0% of their initial stored energy?
An emf source with E = 120 V, a resistor with R = 80.0 鈩�, and a capacitor with C = 4.00 碌F 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?
Q) A straight, nonconducting plastic wire 8.50 cm long carries a charge density of +175 nC/m distributed uniformly along its length. It is lying on a horizontal tabletop. (a) Find the magnitude and direction of the electric field this wire produces at a point 6.00 cm directly above its midpoint. (b) If the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 6.00 cm directly above its center.
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