Physics 07 - General Physics 2 » Fall 2020 » Quiz 3

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Question #1
In a parallel circuit,
A.   the potential drop is the sum of those in all branches.
B.   the current is the same in every branch.
C.   the resistance is the sum of the resistances of the branches.
D.   the potential drop is the same for each element of the parallel circuit.
E.   the heat generated is the same in all branches.
Question #2
Two resistors are connected in series across a potential difference. If the current carried by resistor A is I, what is the current carried by B?
A.   II2
B.   2I
C.   II4
D.   I
E.   4I
Question #3
The power dissipated in each of two resistors is the same. The potential drop across resistor A is twice that across resistor B. If the resistance of resistor B is R, what is the resistance of A?
A.   R
B.   R/4
C.   2R
D.   4R
E.   R/2
Question #4
The conservation of energy in an electric circuit is closely related to which of the following?
A.   Kirchhoff's junction rule
B.   Newton's laws
C.   Kirchhoff's loop rule
D.   Ampère's law
E.   Ohm's law
Question #5
For copper, ρ = 8.93 g/cm3 and M = 63.5 g/mol. Assuming one free electron per copper atom, what is the drift velocity of electrons in a copper wire of radius 0.435 mm carrying a current of 5 A?
A.   2.11 × 10–4 m/s
B.   5.43 × 10–4 m/s
C.   4.67 × 10–4 m/s
D.   8.37 × 10–4 m/s
E.   6.21 × 10–4 m/s
Question #6
A wire of length L and resistance R is now drawn out by pulling such that its new resistance is 15R. What is its new length? (Assume the density remains constant.)
A.   2.25L
B.   2.58 × 10–1·L
C.   6.67 × 10–1·L
D.   1.50L
E.   3.87L
Question #7
A potential difference of 120 V produces a current of 8.0 A in the heating element of a toaster. What is the resistance of this heating element while the toaster is carrying this current?
A.   67 Ω
B.   6.7 × 10–2 Ω
C.   30 Ω
D.   0.96 kΩ
E.   15 Ω
Question #8
A resistor of 2 Ω and another of 3 Ω are connected in parallel, and this combination is joined in series with a 4-Ω resistor across a battery. If the current in the 2-Ω resistor is 2.0 A, the potential drop across the 3-Ω resistor is
A.   4.0 V.
B.   6.0 V.
C.   2.4 V.
D.   1.2 V.
E.   8.0 V.
Question #9
A 1.2-μF capacitor in a flash camera is charged by a 1.5-V battery. When the camera flashes, this capacitor is discharged through a resistor. The time constant of the circuit is 10 ms. What is the value of the resistance?
A.   8.0 × 10–2 Ω
B.   8.3 kΩ
C.   3.1 kΩ
D.   12 kΩ
E.   0.12 Ω

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