When temperature is above ferromagnetic Curie temperature, a ferromagnetic mater

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

Correct Answer

becomes a paramagnetic material

Explanation

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

More questions

2. To prevent a DC return between source and load, it is necessary to use
Options
A. resistor between source and load
B. inductor between source and load
C. capacitor between source and load
D. either (a) or (b)

5. Which of the following is wrong for a magic used to tee?
Options
A. E and H arms are decoupled
B. coplanar arms are coupled
C. all ports are perfectly matched
D. A signal into coplanar arm splits equally between E and H arms

6. A UJT exhibits negative resistance characteristics when
Options
A. Current is less than valley current
B. Current is less than peak current
C. Current is more than peak current but less than valley current
D. None of the above

7. The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ? t ? a and f(t) = 0 for t > a is
Options
A. a step function
B. a pulse function
C. a shifted step function originating at t = a
D. none of the above

9. TE₁₀ mode of propagation of electromagnetic energy in waveguides can be thought of as
Options
A. three TEM waves travelling along length of wave-guide
B. One TEM wave travelling along length of wave guide and one TEM wave propagation in the transverse plane
C. One TEM wave travelling along the length of wave guide and two TEM waves
D. none of the above

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