Exercise: Materials And Components

Questions for: Materials And Components

A magnet does not attract
A:
nickel
B:
iron
C:
copper
D:
iron and copper
Answer: C

Only copper is non-magnetic.

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When temperature is above ferromagnetic Curie temperature, a ferromagnetic material
A:
becomes a paramagnetic material
B:
becomes a very strong ferromagnetic material
C:
becomes diamagnetic material
D:
none of the above
Answer: A

Above ferromagnetic Curie temperature, ferro-magnetic material behaves as a paramagnetic material.

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∈0 has no other physical meaning than that of a fundamental conversion factor.
A:
True
B:
False
C:
D:
Answer: A
No answer description is available. Let's discuss.
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The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about
A:
sign of charge carrier
B:
density of charge carrier
C:
both sign and density of charge carrier
D:
none of the above
Answer: C
No answer description is available. Let's discuss.
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The Ohm's law for conduction in metals is
A:
J = σE
B:
J =
C:
J ∝ σE
D:
J ∝
Answer: A
No answer description is available. Let's discuss.
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