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Electronics - Magnetism and Electromagnetism

@ : Home > Electronics > Magnetism and Electromagnetism > General Questions

Exercise

"In the middle of difficulty lies opportunity."
- Albert Einstein
1. 

Permeability is the inverse equivalent of which electrical term?
A. VoltageB. Current
C. ResistanceD. Conductance
2. 

Which electromagnetic device uses brushes and a commutator?
A. A speaker
B. A dc generator
C. A relay
D. A solenoid
3. 

What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?
A. 12,000 mu.gifT
B. 83,330 T
C. 0 T
D. More information is needed in order to find flux density.
4. 

How much flux is there in a magnetic field when its flux density is 5000 mu.gifT and its cross-sectional area is 300 mm2?
A. 16.67 mWb
B. 5.0 mu.gifWb
C. 3.0 mWb
D. 1.5 mu.gifWb
5. 

What are the effects of moving a closed wire loop through a magnetic field?
A. A voltage is induced in the wire.
B. A current is induced in the wire.
C. The polarity across the wire depends on the direction of motion.
D. All of the above

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