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- 1. Multiple Choice
The unit of magnetic flux is.....
Tesla
Ampere
Henry
Weber
- 2. Multiple Choice
MMF stands for
magnetic most force
Magneto motive force
Mechanical motive force
None of the above
- 3. Multiple Choice
The opposition to the flow of flux is called as.....
Resistance
Resilience
Reluctance
Permeance
- 4. Multiple Choice
Magnetisation curve is plotted between...........
B&H
B&V
V&I
I&R
- 5. Multiple Choice
In magnetic circuits, H stands for......
Magnetic flux density
Permeability
Magnetic field strength
Magnetic flux
- 6. Multiple Choice
8.An insulator is a material that _______.
produces heat and light.
does not easily allow the flow of electricity
is expensive.
connects batteries to wires in a circuit
- 7. Multiple Choice
Material that allows electric current or heat to flow through easily.
electromagnetic field
conductor
open circuit
electric current
- 8. Multiple Choice
The space around a magnet where magnetism acts is known as the _______________.
attraction
strength
field of gravity
magnetic field
- 9. Multiple Choice
Lenz's law states that the induced voltage across an inductor ____.
Always opposes the current through the inductor
Always opposes any change in current
Changes polarity as current changes direction
Always opposes the applied votage
- 10. Multiple Choice
The production of a voltage across an inductor as a result of its own expanding or contracting magnetic field is called ____.
Flux density
Self-inductance
Counter emf
Faraday's second law
- 11. Multiple Choice
Reciprocal of reluctance is
Reluctivity
Permeance
Permiability
Susceptibility
- 12. Multiple Choice
Ohm’s law for magnetic circuits is _________
F=ϕS
F=ϕ/S
F=ϕ2S
F=ϕ/S2
- 13. Multiple Choice
What device uses an electromagnet?
speakers in headphones
a light bulb
scissors
a phone charger
- 14. Multiple Choice
The two opposites ends on a magnet are known as _______________.
electromagnet
attract
poles
magnetic field
- 15. Multiple Choice
In order to induce a voltage across a coil ____.
c)T
The coil must be in motion
Current must be increasing
There must be relative motion between the coil and the magnetic field
The coil must be cut by at least 10^8 lines of force per second
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