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Chapter 28: Q. 45 (page 792)
What is the equivalent resistance between points a and b in FIGURE P28.45?
The equivalent resistance will be.
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The switch in FIGURE EX28.36 has been in position a for a long time. It is changed to position b at . What are the charge on the capacitor and the current through the resistor immediately after the switch is closed? at ? at ?
A. Load resistor R is attached to a battery of emf E and internal resistance r. For what value of the resistance R, in terms of E and r, will the power dissipated by the load resistor be a maximum?
B. What is the maximum power that the load can dissipate if the battery has and localid="1649415601268" ?
FIGURE Q28.13 shows the voltage as a function of time of a capacitor as it is discharged (separately) through three different resistors. Rank in order, from largest to smallest, the values of the resistances
The five identical bulbs in FIGURE are all glowing. The battery is ideal. What is the order of brightness of the bulbs, from brightest to dimmest? Some may be equal.
A.
B.
C.
D.
An oscillator circuit is important to many applications. A simple oscillator circuit can be built by adding a neon gas tube to an RC circuit, as shown in . Gas is normally a good insulator, and the resistance of the gas tube is essentially infinite when the light is off. This allows the capacitor to charge. When the capacitor voltage reaches a value Von, the electric field inside the tube becomes strong enough to ionize the neon gas. Visually, the tube lights with an orange glow. Electrically, the ionization of the gas provides a very-low-resistance path through the tube. The capacitor very rapidly (we can think of it as instantaneously) discharges through the tube and the capacitor voltage drops. When the capacitor voltage has dropped to a value , the electric field inside the tube becomes too weak to sustain the ionization and the neon light turns off. The capacitor then starts to charge again. The capacitor voltage oscillates between , when it starts charging, and , when the light comes on to discharge it.
a. Show that the oscillation period is
b. A neon gas tube has . What resistor value should you choose to go with a capacitor and a battery to make a oscillator?
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