Question

5. In the RC circuit shown below, what may be said about the circuit after the switch has been closed for a very long time? a. There are no free electric charges in the battery. b. The battery still provides a potential difference. c. The electric field in the wire is zero. d. The capacitor acts as a short circuit. e. The resistor still creates a drop in potential. V R C, 6. A resistor of unknown resistance and a 15 $\Omega$ resistor are connected across a source of a 20 V EMF in such a way that 2.0 A of current is observed. What is the value of the unknown resistance? a. 5 $\Omega$ b. 10 $\Omega$ c. 15 $\Omega$ d. 30 $\Omega$ 7. A 1/4-wavelength radio antenna needs to transmit 1200 kHz radio waves. What should the height of the antenna be? a. 0.016 m b. 15.6 m c. 62.5 m d. 250 m 8. A loop of wire is moving in a uniform magnetic field as shown below. In which direction is the current flowing in the wire? a. Down b. No current c. Clockwise d. Counter-clockwise X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X

          5. In the RC circuit shown below, what may be said about the
circuit after the switch has been closed for a very long time?
a. There are no free electric charges in the battery.
b. The battery still provides a potential difference.
c. The electric field in the wire is zero.
d. The capacitor acts as a short circuit.
e. The resistor still creates a drop in potential.
V
R
C,
6. A resistor of unknown resistance and a 15 $\Omega$ resistor are connected across a source of a 20 V
EMF in such a way that 2.0 A of current is observed. What is the value of the unknown
resistance?
a. 5 $\Omega$
b. 10 $\Omega$
c. 15 $\Omega$
d. 30 $\Omega$
7. A 1/4-wavelength radio antenna needs to transmit 1200 kHz radio waves. What should the
height of the antenna be?
a. 0.016 m
b. 15.6 m
c. 62.5 m
d. 250 m
8. A loop of wire is moving in a uniform magnetic field as shown below. In which direction is
the current flowing in the wire?
a. Down
b. No current
c. Clockwise
d. Counter-clockwise
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X

5. In the RC circuit shown below, what may be said about the
circuit after the switch has been closed for a very long time?
a. There are no free electric charges in the battery.
b. The battery still provides a potential difference.
c. The electric field in the wire is zero.
d. The capacitor acts as a short circuit.
e. The resistor still creates a drop in potential.
V
R
C,
6. A resistor of unknown resistance and a 15 Ω resistor are connected across a source of a 20 V
EMF in such a way that 2.0 A of current is observed. What is the value of the unknown
resistance?
a. 5 Ω
b. 10 Ω
c. 15 Ω
d. 30 Ω
7. A 1/4-wavelength radio antenna needs to transmit 1200 kHz radio waves. What should the
height of the antenna be?
a. 0.016 m
b. 15.6 m
c. 62.5 m
d. 250 m
8. A loop of wire is moving in a uniform magnetic field as shown below. In which direction is
the current flowing in the wire?
a. Down
b. No current
c. Clockwise
d. Counter-clockwise
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X

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