Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

from zero to its rms value
from 10% of the peak value to 90% of the peak value
from 10% of the peak value to 70.7% of the peak value
None of these
from zero to its peak value

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is most apparent when the core material is saturated
Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
None of these

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