Physics 1b Quiz Page 3
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47. A 1 000-V battery, a 3 000- Ω resistor and a 0.50-µF capacitor are connected in series with a switch. The time constant
for such a circuit, designated by the Greek letter, τ, is defined as the time required to charge the capacitor to 63% of
its capacity after the switch is closed. What is the value of τ for this circuit?
=
= 3000 × 0.5 − 6 = 1.5 − 3
9
a. 6.0 × 10
s
-10
b. 1.7 × 10
s
-7
c. 1.7 × 10
s
-3
d. 1.5 × 10
S
ε
= 20 V, at what rate is thermal energy being generated in the 20- Ω resistor?
8. If
= 3 ×
=>
= 10Ω
= 10 + 20 + 40 = 70Ω
=
= 0.3 =>
=
= 0.29 × 20 = 1.6
a. 6.5 W
b. 1.6 W
c. 15 W
d. 26 W
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