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Q25.1
Two copper wires of different diameter are joined in series in a
circuit. A current flows in the wire combination.
When the current flows from the larger-diameter wire into the
smaller-diameter wire,
A. the current increases.
B. the current decreases.
C. the current stays the same.
D. not enough information given to decide
A25.1
Two copper wires of different diameter are joined in series in a
circuit. A current flows in the wire combination.
When the current flows from the larger-diameter wire into the
smaller-diameter wire,
A. the current increases.
B. the current decreases.
C. the current stays the same.
D. not enough information given to decide
Q25.2
Two copper wires of different diameter are joined in series in a
circuit. A current flows in the wire combination.
When the current flows from the larger-diameter wire into the
smaller-diameter wire,
A. the drift velocity increases.
B. the drift velocity decreases.
C. the drift velocity stays the same.
D. not enough information given to decide
A25.2
Two copper wires of different diameter are joined in series in a
circuit. A current flows in the wire combination.
When the current flows from the larger-diameter wire into the
smaller-diameter wire,
A. the drift velocity increases.
B. the drift velocity decreases.
C. the drift velocity stays the same.
D. not enough information given to decide
Q25.3
Electrons in an electric circuit pass through a resistor. Compared
to the potential energy of an electron before entering the resistor,
the potential energy of an electron after leaving the resistor is
A. greater.
B. less.
C. the same.
D. not enough information given to decide
A25.3
Electrons in an electric circuit pass through a resistor. Compared
to the potential energy of an electron before entering the resistor,
the potential energy of an electron after leaving the resistor is
A. greater.
B. less.
C. the same.
D. not enough information given to decide
Q25.4
Electrons in an electric circuit pass through a source of emf.
Compared to the potential energy of an electron before entering
the source of emf, the potential energy of an electron after leaving
the source of emf is
A. greater.
B. less.
C. the same.
D. not enough information given to decide
A25.4
Electrons in an electric circuit pass through a source of emf.
Compared to the potential energy of an electron before entering
the source of emf, the potential energy of an electron after leaving
the source of emf is
A. greater.
B. less.
C. the same.
D. not enough information given to decide
Q25.5
Two copper wires. First wire is 2 m long and has a radius of 2
mm. The second one is 1 m long and has a radius of 1 mm.
Which one has a higher resistance
A. First wire
B. Second wire.
C. Both have the same resistance.
D. not enough information given to decide
A25.5
Two copper wires. First wire is 2 m long and has a radius of 2
mm. The second one is 1 m long and has a radius of 1 mm.
Which one has a higher resistance
A. First wire
B. Second wire.
C. Both have the same resistance.
D. not enough information given to decide
Q25.6
In the circuit shown, the two bulbs
A and B are identical. The arrow
indicates the direction of current
flow. Compared to bulb A,
A. bulb B glows more brightly because the current speeds up
as it enters lower potential region.
B. bulb B glows less brightly because the bulb A already used
up some of the current.
C. bulb B glows just as brightly.
D. answer depends on whether the mobile charges in the wires
are positively or negatively charged
A25.6
In the circuit shown, the two bulbs
A and B are identical. The arrow
indicates the direction of current
flow. Compared to bulb A,
A. bulb B glows more brightly because the current speeds up
as it enters lower potential region.
B. bulb B glows less brightly because the bulb A already used
up some of the current.
C. bulb B glows just as brightly.
D. answer depends on whether the mobile charges in the wires
are positively or negatively charged
Q25.7
In the circuits shown in (a) and (b), all the bulbs are identical and the
emf sources are identical and are assumed to be ideal. Which circuit
consumes more power
A. (a)
B. (b)
C. same
D. any of the above, depending on the rated wattage of the bulb.
A25.7
In the circuits shown in (a) and (b), all the bulbs are identical and the
emf sources are identical and are assumed to be ideal. Which circuit
consumes more power
A. (a)
B. (b)
C. same
D. any of the above, depending on the rated wattage of the bulb.
Q25.8
In the circuits shown in (a) and (b), all the bulbs are identical and the
emf sources are identical and have same internal resistance.
Which circuit consumes more power
A. (a)
B. (b)
C. same
D. any of the above, depending on the resistance of the bulb.
A25.8
In the circuits shown in (a) and (b), all the bulbs are identical and the
emf sources are identical and have same internal resistance.
Which circuit consumes more power
A. (a)
B. (b)
C. same
D. any of the above, depending on the resistance of the bulb.
Q25.9
An ideal voltmeter
A. has zero resistance and should be connected in
parallel with the circuit element being measured.
B. has zero resistance and should be connected in series
with the circuit element being measured.
C. has infinite resistance and should be connected in
parallel with the circuit element being measured.
D. has infinite resistance and should be connected in
series with the circuit element being measured.
A25.9
An ideal voltmeter
A. has zero resistance and should be connected in
parallel with the circuit element being measured.
B. has zero resistance and should be connected in series
with the circuit element being measured.
C. has infinite resistance and should be connected in
parallel with the circuit element being measured.
D. has infinite resistance and should be connected in
series with the circuit element being measured.
Q25.10
An ideal ammeter
A. has zero resistance and should be connected in
parallel with the circuit element being measured.
B. has zero resistance and should be connected in series
with the circuit element being measured.
C. has infinite resistance and should be connected in
parallel with the circuit element being measured.
D. has infinite resistance and should be connected in
series with the circuit element being measured.
A25.10
An ideal ammeter
A. has zero resistance and should be connected in
parallel with the circuit element being measured.
B. has zero resistance and should be connected in series
with the circuit element being measured.
C. has infinite resistance and should be connected in
parallel with the circuit element being measured.
D. has infinite resistance and should be connected in
series with the circuit element being measured.
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