The circuit below contains three 100-W light bulbs and a capacitor. The emf is 110 V and the capacitor is fully charged. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
A and C
[Ques. 2] The diagram shown represents a portion of a wire in a circuit. A current is flowing in the wire in the direction shown. Under the convention that it is positive charge that flows the electric field points in the direction of the current. How can the electric field change direction where the wire bends?
a.
There is an excess of negative charge in the center of the wire.
b.
There is an excess of positive charge at the bottom end of the wire.
c.
There is an excess of negative charge at the right end of the upper portion of the wire.
d.
There is an accumulation of positive charge on the surface, particularly at the bend, such that the sum of electric fields gives the new electric field.
e.
There is an accumulation of electrical potential as the current traverses the wire: The higher potential in the lower half is the source of the field.
[Ques. 3] The circuit below contains three resistors, A, B, and C, which all have equal resistances. The emf = 110V. Which resistor generates the most thermal energy after the switch is closed?
a.
A
b.
B
c.
C
d.
A and B
e.
All three generate equal amounts of thermal energy.
[Ques. 4] The circuit below contains three 100-W light bulbs and a capacitor. The emf = 110V. At the instant the switch S is closed, which light bulb is brightest?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
[Ques. 5] The circuit below contains three 100-watt light bulbs and a capacitor. The emf = 110V. The capacitor is fully charged. Which light bulb(s) is(are) dimmest?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright (or dim).
[Ques. 6] The circuit below contains three 100-watt light bulbs. The emf = 110 V. Which light bulb(s) is(are) the brightest?
a.
A
b.
B
c.
C
d.
B and C
e.
All three are equally bright.
[Ques. 7] The circuit below contains three 100-W light bulbs. The emf = 110 V. Which light bulb(s) is(are) brightest?
a.
A
b.
B
c.
C
d.
B and C
e.
All three are equally bright.
[Ques. 8] The algebraic sum of the changes of potential around any closed circuit loop is
a.
zero.
b.
maximum.
c.
zero only if there are no sources of emf in the loop.
d.
maximum if there are no sources of emf in the loop.
e.
equal to the sum of the currents in the branches of the loop.
[Ques. 9] When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is
a.
zero.
b.
at its maximum value.
c.
equal to the current in a resistive circuit in parallel with the capacitor circuit.
d.
greater than the current in a resistor that is farther from the battery than the capacitor.
e.
zero if it is the only capacitor, but maximum if there is another capacitor in series with it.
[Ques. 10] In a loop in a closed circuit, the sum of the currents entering a junction equals the sum of the currents leaving a junction because
a.
the potential of the nearest battery is the potential at the junction.
b.
there are no transformations of energy from one type to another in a circuit loop.
c.
capacitors tend to maintain current through them at a constant value.
d.
current is used up after it leaves a junction.
e.
charge is neither created nor destroyed at a junction.
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