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- 1. Multiple ChoiceElectromagnetic induction is change in ___________________.surface areamagnetic polesmagnetic flux
- 2. Multiple ChoiceThe process of generating the current in a conductor is called asElectro motive forceElectromagnetic inductiongenerator energy conversioninduced voltage
- 3. Multiple Choice
When a conductor is moved to cut through the magnetic flux, an _______________ is produced.
induced current
electromotive force
electromagnetic induction
internal resistance
- 4. Multiple Choice
The production of electric current by a changing magnetic field is called ____________________________________.
induced current
electromotive force
electromagnetic induction
internal resistance
- 5. Multiple Choice
No EMF is induced when?
When the wire is not moving
When the wire is parallel to magnetic field direction
When no lines are cut by the wire
all of the above
- 6. Multiple ChoiceWhat would happen if I move a bar magnet in and out of a coil of copper wire?Electric current would disappearThe magnet would explodeElectric current will flow through the wireIt would produce a gravitational field
- 7. Multiple Choice
Faraday’s Law states that the magnitude of the induced e.m.f. is _________________ to the rate of change of magnetic flux linkage with the solenoid.
equal
inversely proportional
directly proportional
- 8. Multiple Choice
____________law states that the direction of the induced current is such that it always _______ ___ the change producing it.
Lenz's Law, oppose
Faraday's Law, oppose
Lez's Law, follow
Faraday's Law, follow
- 9. Multiple Choice
The voltage induced in a conductor is ___________ ___________ to the rate which the conductor cuts the magnetic lines of force.
inversely proportional
directly proportional
negatively coorelated
absolutely opposite
- 10. Multiple Choice
What happens to the galvanometer if the copper rod is moved upwards?
No change
Deflect to the right
Deflect to the left
Deflect to the right and left
- 11. Multiple Choice
Which action will increase the deflection of the galvanometer pointer?
The magnetic pole is reversed
The number of turns of coil is increased
The coil is made from insulated wire
The magnet is slowly pushed into the coil
- 12. Multiple Choice
The d.c generator and a.c generator make use of electromagnetic induction to produce _______________________
force
electricity
energy
power
- 13. Multiple Choice
Which device uses slip rings?
a cathode-ray tube
a d.c. generator
an a.c. generator
a dc motor
- 14. Multiple Choice
Which of the following increases frequency of alternating induced current?
increasing number of turns on the coil
using a stronger magnet
rotating the coil faster
increase area of the coil
- 15. Multiple ChoiceVoltage can be induced in a wire bya. moving the wire near a magnet.b. moving a magnet near the wire.c. changing the current in a nearby wire.d. all of these
- 16. Multiple Choice
In Fleming's Right Hand Rule, 1st finger and centre finger represent
current, magnetic field
magnetic field, current
force, current
magnetic field, force
- 17. Multiple Choice
___________________rule can be used to determine the direction of the induced current produced.
Fleming's Left Hand Rule
Fleming's Right Hand Rule
Right Hand Grip Rule
- 18. Multiple Choice
Which rule is used to find the direction of magnetic field around a straight conductor
Flemming left hand rule
Lenz law
Flemmings right hand rule
Right hand thumb rule
- 19. Multiple ChoiceAC generators have2 slip rings1 slip ring3 slip rings4 slip rings
- 20. Multiple ChoiceA magnet can move in a coil of wire to produce electricity in which system?GeneratorMotorMagnetTransformer
- 21. Multiple Choice
In order for electromagnetic induction to occur, you need...
a conductor
a magnetic field
relative motion
all three
- 22. Multiple Choice
What does the index finger show you in the Flemming's right-hand rule?
Direction of current
Motion of wire
Direction of electric field
Direction of magnetic field
- 23. Multiple Choice
The Flemming's right-hand rule is used when ....
motion causes current
current causes motion
current causes potential difference
motion causes magnetic field
- 24. Multiple Choice
If the coil is moving anti-clockwise, state the direction of the current on the left wire.
Upward
Downward
Into the paper
Out of the paper
- 25. Multiple Choice
AC generators convert ___________ energy to ____________energy.
pressure/force
mechanical/electrical
chemical/electrical
kinetic/relative
- 26. Multiple Choice
In a _______ a spinning turbine moves magnets which generates an electric current.
Motor
Generator
- 27. Multiple ChoiceIn large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.WindWaterMagnetsCircuits
- Answer choicesTagsAnswer choicesTags