Electronics - Magnetism and Electromagnetism

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Exercise : Magnetism and Electromagnetism - General Questions
1.
Permeability is the inverse equivalent of which electrical term?
Voltage
Current
Resistance
Conductance
Answer: Option
Explanation:
No answer description is available. Let's discuss.

2.
Which electromagnetic device uses brushes and a commutator?
A speaker
A dc generator
A relay
A solenoid
Answer: Option
Explanation:
No answer description is available. Let's discuss.

3.
What is the flux density of a magnetic field whose flux is 3000 µWb and cross-sectional area is 0.25 m2?
12,000 mu.gifT
83,330 T
0 T
More information is needed in order to find flux density.
Answer: Option
Explanation:
No answer description is available. Let's discuss.

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?
16.67 mWb
5.0 mu.gifWb
3.0 mWb
1.5 mu.gifWb
Answer: Option
Explanation:
No answer description is available. Let's discuss.

5.
What are the effects of moving a closed wire loop through a magnetic field?
A voltage is induced in the wire.
A current is induced in the wire.
The polarity across the wire depends on the direction of motion.
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.