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- 1. Multiple Choice
Lenz’s Law of electromagnetic induction is about the conservation of
Energy.
Mass.
Charges.
Momentum
- 2. Multiple Choice
An e.m.f will be induced in a straight conductor if
the conductor is stationary across a constant magnetic flux.
a constant magnetic flux is placed parallel to the conductor.
the conductor cuts across a constant magnetic flux.
the conductor moves parallel to a constant magnetic flux.
- 3. Multiple Choice
According to the Lenz’s Law,
the induced e.m.f is proportional to the magnetic field.
the direction of the induced e.m.f is such that it will oppose the change causing it.
Fleming’s Left hand rule can be used to determine the direction of induced e.m.f.
the induced e.m.f is always in opposite direction to the magnetic field.
- 4. Multiple Choice
The magnetic field produced by a long straight current-carrying wire is
proportional to both the current in the wire and the distance from the wire.
proportional to the current in the wire and inversely proportional to the distance from the wire.
inversely proportional to the current in the wire and proportional to the distance from the wire.
inversely proportional to both the current in the wire and the distance from the wire.
- 5. Multiple Choice
Determine the factors which will not increases the induce emf of a coil
increasing the magnetic field.
increasing the cross sectional area of the coil
increasing the number of turns of the coil
decreasing the strength of magnetic field
- 6. Multiple Choice
Which of the following is not the unit for magnetic field strength?
Tesla
Weber per meter squared
Weber per second squared
Gauss
- 7. Multiple Choice
Number of magnetic field line passes through an area is the definition for
magnetic flux
current carrying conductors
induced emf
magnetic field
- 8. Multiple Choice
Rate of change in magnetic flux is
proportional to induced emf
inversely proportional to induced current
equal to magnetic flux
directly proportional to wire
- 9. Multiple ChoiceThe voltage induced across an inductor as its magnetic field collapses is called ____.Counter emfTransition voltageReverse voltageCounter voltage
- 10. 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
- 11. 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
- 12. 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
- 13. Multiple Choice
The unit of inductance is:
volt
Ampere
Farad
Henry
- 14. Multiple Choice
1 Henry is equivalent to
Weber.Tesla
V.s/A
Tesla/s
Weber.A/s
- 15. Multiple Choice
As the switch is closed, the lamp will
Glow instantly
Glow gradually
Glow then go dim
Never light up.
- 16. 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
- 17. 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
- 18. 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.
- 19. 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
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