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**Unformatted text preview: **0‘) PHYSICS 2B(a) . QUIZ 5 CODE #
PROF. SCHULLER APRIL 30. 1999
1. A wire of resistance 5.0 Qis connected to a battery wire whose emf E is 2.0 V and whose internal resistance is 1.0 Q. In 2.0 min, (a) how much energy is
transferred from chemical to electrical form? (b) How much energy appears in the
wire as thermal energy? (c) Account for the difference between (a) and (b). V U Nimkﬂtal (KIIJ‘I'UMCQ/ of— E K {ilk—wit
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PROF. SCHULLER ‘ CODE #
APRIL 30, 1999 2. A battery of emf E = 20 Volts is connected across a 6.0 pF capacitor and a 200 Q
resistor in series. Assuming that at t = 0 the switch is closed, calculate: (a) the initial current in the circuit.
(b) the ﬁnal charge on the capacitor.
(c) the charge on the capacitor at t = 6.0 x 10‘1 seconds. (d) the current at t = 18.0 x104 seconds. L
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3. (a) In the ﬁgure below, what' ts the equivalent resistance of the network shown? (b) What are the currents in each resistor?
PutR =IOOQ, R =R =SOQ, R =759. £= 6..OV é? : l
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PROF. SCHULLER ’ APRIL 30, 1999 l. (a) In the ﬁgure below, what value RINK R have if the current in the circuit is to
be 1.0 mA? Take 81:39.0 v, 52 £3.94, and r, = r2 = 3.0 Q. (b) What is the rate at which thermal energy appears in R? PHYSICS 2B(b) 7 QUIZ 5 CODE #
PROF. SCHULLER APRIL 30, 1999 3. (a) In the ﬁgure below, what power appears as thermal energy in R]? In R2? In R3?
(b) What power is supplied by 8]? By 82 ? (c) Discuss the energy balance in this circuit. Assume that
£1: 3.0 V, 82 = 1.0 V, R2 5.0 9, R2 = 2.0 Q, and R3 = 4.0 Q. . e elcanm— m. - WW
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PROF. SCHULLER ' APRIL 30, 1999 3. (a) In the ﬁgure below, what power appears as thermal energy in R,? In R2? In R3?
(b) What power is supplied by E, ? By 82 ? (c) Discuss the energy balance in this circuit. Assume that
E: = 3.0 V, 82 =1.0 V, R, = 5.0 9, R2 = 2.0 Q, and R3 =4.0 (2. \Q . Mu, CHI/U l“
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