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- 1. Multiple ChoiceThe voltage induced across an inductor as its magnetic field collapses is called ____.Counter emfTransition voltageReverse voltageCounter voltage
- 2. Multiple ChoiceIn order to induce a voltage across a coil ____.The coil must be in motionCurrent must be increasingThere must be relative motion between the coil and the magnetic fieldThe coil must be cut by at least 10^8 lines of force per second
- 3. Multiple ChoiceLenz's law states that the induced voltage across an inductor ____.Always opposes the current through the inductorAlways opposes any change in currentChanges polarity as current changes directionAlways opposes the applied votage
- 4. Multiple Choice
An inductor ____.
All of the above
Provides a specific value of inductance
Opposes any change in current
Stores energy in a magnetic field
- 5. Multiple ChoiceThe production of a voltage across an inductor as a result of its own expanding or contracting magnetic field is called ____.Flux densitySelf-inductanceCounter emfFaraday's second law
- 6. Multiple ChoiceThe most practical way to change the magnetic field of an inductor is to increase or decrease the current through the coil.falsetrue
- 7. Multiple Choicethe voltage induced across an inductor is inversely proportional to the rate of change of magnetic flux.truefalse
- 8. Multiple Choice
The unit of inductance is:
volt
Ampere
Farad
Henry
- 9. Multiple ChoiceAn inductor opposes any change in:voltagecurrentfrequencyreactance
- 10. Multiple Choice
1 Henry is equivalent to
Weber.Tesla
V.s/A
Tesla/s
Weber.A/s
- 11. Multiple Choice
As the switch is closed, the lamp will
Glow instantly
Glow gradually
Glow then go dim
Never light up.
- 12. Multiple Choice
After the switch is has been closed for a very long time, it is opened, what will the lamp do?
It glows
It doesn't glow
gradually goes dim
Dims then gradually glows
- 13. Multiple Choice
the graph represents the current across all but one
across a capacitor during discharging
across a resistor during discharging
across an inductor during discharge
across a capacitor during charging up
- 14. Multiple Choice
The blue graph line represents
the increase in current across a resistor in an RL circuit.
the increase in current across a inductor in an RL circuit.
the increase in current across a capacitor in an RC circuit.
the increase in current across a resistor in an RC circuit.
- 15. Multiple Choice
an inductor go inductance 5mH, is connected in series with a 20 ohm resistor, the inductance time constant is
2.5x10^-4 s
4x10^4 s
0.1s
100s
- Answer choicesTagsAnswer choicesTags