Transcript up11_educue_ch30

Q30.1
A small, circular ring of wire is
inside a larger loop that is
connected to a battery and a switch
S. The small ring and the larger
loop both lie in the same plane.
When the switch S is closed,
1. a clockwise current flows in the ring,
caused by self-inductance
2. a counterclockwise current flows in the ring,
caused by self-inductance
3. a clockwise current flows in the ring,
caused by mutual inductance
4. a counterclockwise current flows in the ring,
caused by mutual inductance
A30.1
A small, circular ring of wire is
inside a larger loop that is
connected to a battery and a switch
S. The small ring and the larger
loop both lie in the same plane.
When the switch S is closed,
1. a clockwise current flows in the ring,
caused by self-inductance
2. a counterclockwise current flows in the ring,
caused by self-inductance
3. a clockwise current flows in the ring,
caused by mutual inductance
4. a counterclockwise current flows in the ring,
caused by mutual inductance
Q30.2
A current i flows through an inductor L in the
direction from point a toward point b. There is zero
resistance in the wires of the inductor.
If the current is decreasing,
1. the potential increases from point a to point b
2. the potential drops from point a to point b
3. answer depends on the magnitude of di/dt
compared to the magnitude of i
4. answer depends on the value of the inductance L
5. both 3. and 4. are correct
A30.2
A current i flows through an inductor L in the
direction from point a toward point b. There is zero
resistance in the wires of the inductor.
If the current is decreasing,
1. the potential increases from point a to point b
2. the potential drops from point a to point b
3. answer depends on the magnitude of di/dt
compared to the magnitude of i
4. answer depends on the value of the inductance L
5. both 3. and 4. are correct
Q30.3
A steady current flows through an inductor. If the current is
doubled while the inductance remains constant, the amount of
energy stored in the inductor
1. increases by a factor of 21/2
2. increases by a factor of 2
3. increases by a factor of 4
4. increases by a factor that depends on
the geometry of the inductor
5. none of the above
A30.3
A steady current flows through an inductor. If the current is
doubled while the inductance remains constant, the amount of
energy stored in the inductor
1. increases by a factor of 21/2
2. increases by a factor of 2
3. increases by a factor of 4
4. increases by a factor that depends on
the geometry of the inductor
5. none of the above
Q30.4
An inductor (inductance L) and a
resistor (resistance R) are
connected to a source of emf as
shown. When switch S is closed, a
current begins to flow and grows
until it reaches a final value.
The final value of the current
1. is directly proportional to both R and L
2. is directly proportional to R and inversely proportional to L
3. is inversely proportional to R and directly proportional to L
4. is inversely proportional to both R and L
5. is independent of L
A30.4
An inductor (inductance L) and a
resistor (resistance R) are
connected to a source of emf as
shown. When switch S is closed, a
current begins to flow and grows
until it reaches a final value.
The final value of the current
1. is directly proportional to both R and L
2. is directly proportional to R and inversely proportional to L
3. is inversely proportional to R and directly proportional to L
4. is inversely proportional to both R and L
5. is independent of L
Q30.5
An inductor (inductance L) and a
resistor (resistance R) are
connected to a source of emf as
shown. When switch S is closed, a
current begins to flow and grows
until it reaches a final value.
The time required for the current to reach half of its final value
1. is directly proportional to both R and L
2. is directly proportional to R and inversely proportional to L
3. is inversely proportional to R and directly proportional to L
4. is inversely proportional to both R and L
5. is independent of L
A30.5
An inductor (inductance L) and a
resistor (resistance R) are
connected to a source of emf as
shown. When switch S is closed, a
current begins to flow and grows
until it reaches a final value.
The time required for the current to reach half of its final value
1. is directly proportional to both R and L
2. is directly proportional to R and inversely proportional to L
3. is inversely proportional to R and directly proportional to L
4. is inversely proportional to both R and L
5. is independent of L
Q30.6
An inductor (inductance L) and a capacitor
(capacitance C) are connected as shown.
If the values of both L and C are doubled,
what happens to the time required for the
capacitor charge to oscillate through a
complete cycle?
1. it becomes 4 times longer
2. is becomes twice as long
3. it is unchanged
4. it becomes 1/2 as long
5. it becomes 1/4 as long
A30.6
An inductor (inductance L) and a capacitor
(capacitance C) are connected as shown.
If the values of both L and C are doubled,
what happens to the time required for the
capacitor charge to oscillate through a
complete cycle?
1. it becomes 4 times longer
2. is becomes twice as long
3. it is unchanged
4. it becomes 1/2 as long
5. it becomes 1/4 as long