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Practice Questions



This activity contains 25 questions.

Question 1.

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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Question 2.
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?


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Question 3.
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?


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Question 4.
In Questions 1, 2, and 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?


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Question 5.
A B

In which of the above, if any, is the induced current up?


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Question 6.

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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Question 7.

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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Question 8.

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?


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Question 9.
What will be the direction of the induced current in the small outer loop in the previous question?


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Question 10.
transd.jpg 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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Question 11.
120 volt house current is to be transformed down to 12 volts. What is the ratio of the primary to secondary turns?


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Question 12.
In the preceeding question, if the input current (RMS) is 1.5 amps then the output current is


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Question 13.
transd.jpg A transformer takes 10 volts and 5 amps (both RMS) and changes it to 150 volts. What is the power output of the transformer?


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Question 14.
A transformer has 150 turns on the primary and 20 on the secondary. 100 volts and 10 amps will be changed to


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Question 15.
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?


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Question 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?


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Question 17.


Close the switch in the above circuit by pressing the button below and find the time constant of the circuit.
t= secondsI= amps

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Question 18.
What is the resistance in the circuit in Question 17?


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Question 19.
What is the inductance in the circuit in Question 17?


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Question 20.


The above circuit is discharged by flipping the switch. What is its time constant?
t= secondsI= amps

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Question 21.
What is the resistance in the circuit in Question 20?


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Question 22.
What is the inductance in the circuit in Question 20?


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Question 23.


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?
R= ohms frequency: Hz I= amps

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Question 24.
What is the voltage in the circuit in Question 23?


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Question 25.
If the inductance in the circuit in Question 23 is 30 mH, what is the capacitance?


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