1.
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|
The metal rod in the figure is sliding along a U shaped track as shown. There is a magnetic field in the blue region which is into the figure. What is the direction of the current in the sliding rod?
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| UP |
| DOWN |
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2.
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In the above question, if B=0.4T, L=0.5 m and v= 3 m/s, what is the magnitude of the induced EMF?
|
| 3 volts |
| 2.6 volts |
| 0.6 volts |
| 0 volts |
|
3.
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If the total resistance in the circuit in questions 1 and 2 at a given time is 0.01 ohms what will be the induced current?
|
| 0.6 amps |
| 6 amps |
| 60 amps |
| 600 amps |
|
4.
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In questions 1, 2, amd 3 what would be the total magnetic field into the page 12 mm to the left of the moving rod and still in the blue region?
|
| .4 T |
| .399 T |
| .401 T |
| 0 T |
|
5.
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|
| A |  | B |  |
In which of the above, if any, is the induced current up?
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| A only |
| B only |
| A and B |
| Neither |
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6.
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The current in the wire on the right is increasing, what is the direction of the induced current in the wire loop on the left?
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| clockwise |
| counter-clockwise |
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7.
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The current in the wire on the right is decreasing. What is the direction of the induced current in the wire loop on the left?
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| clockwise |
| counter-clockwise |
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8.
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If the current in the dark wire loop is counter-clockwise and increasing, what is the direction of the induced current in the smaller loop in its middle?
|
| clockwise |
| counter-clockwise |
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9.
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What will be the direction of the induced current in the small outer loop in the previous question.
|
| clockwise |
| counter-clockwise |
|
10.
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A transformer has an input of 110 DC volts, with 100 turns on the primary and 10 turns on the secondary. What is the output voltage?
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| 1100 volts |
| 110 volts |
| 11 volts |
| 0 volts |
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11.
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120 volt house current is to be transformed down to 12 volts. What is the ratio of the primary to secondary turns?
|
| 20-1 |
| 10-1 |
| 1-10 |
| 1-20 |
|
12.
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In the preceeding question, if the input current (RMS) is 1.5 amps then the output current is
|
| .015 amps |
| .15 amps |
| 1.5 amps |
| 15 amps |
|
13.
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A transformer takes 10 volts and 5 amps (both RMS) and changes it to 150 volts. What is the power output of the transformer?
|
| 5 watts |
| 50 watts |
| 150 watts |
| 1500 watts |
|
14.
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A transformer has 150 turns on the primary and 20 on the secondary. 100 volts and 10 amps will be changed to
|
| 13.3 volts and 1.33 amps. |
| 13.3 volts and 75 amps. |
| 750 volts and 1.33 amps. |
| 750 volts and 75 amps. |
|
15.
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50 kW are to be transmitted over wires with a resistance of 1.8 ohms at 300 volts. What is the power loss in the wires?
|
| 50 kW |
| 5 kW |
| 5 W |
| 0 W |
|
16.
|
|
50 kW are to be transmitted over wires with a resistance of 1.8 ohms at 30000 volts. What is the power loss in the wires?
|
| 50 kW |
| 5 kW |
| 5 W |
| 0 W |
|
17.
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Close the switch in the above circuit by pressing the button below and find the time constant of the circuit.
|
| 3 s |
| 6 s |
| 9 s |
| 12 s |
|
18.
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What is the resistance in the circuit in question 17?
|
| 1 ohm |
| 10 ohms |
| 50 ohms |
| 100 ohms |
|
19.
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|
What is the inductance in the circuit in question 17?
|
| 3.33 H |
| 10 H |
| 20 H |
| 30 H |
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20.
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The above circuit is discharged by flipping the switch. What is its time constant?
|
| 2 s |
| 4 s |
| 6 s |
| 8 s |
|
21.
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What is the resistance in the circuit in question 20?
|
| 20 ohms |
| 15 ohms |
| 10 ohms |
| 5 ohms |
|
22.
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What is the inductance in the circuit in question 20?
|
| 10 H |
| 20 H |
| 30 H |
| 40 H |
|
23.
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The following data windows control the above LCR circuit. You can select different values for R and change the frequency by entering new values for f and pressing TAB. What is the resonant frequency of this circuit?
|
| 112 Hz |
| 224 Hz |
| 232 Hz |
| 238 Hz |
| 242 Hz |
| 275 Hz |
|
24.
|
|
What is the voltage in the circuit in question 23?
|
| 10 volts |
| 50 volts |
| 100 volts |
| 120 volts |
|
25.
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|
If the inductance in the circuit in question 23 is 30 mH what is the capacitance?
|
| 10 microF |
| 15 microF |
| 20 microF |
| 30 microF |
