a small e.m.f. is applied to it
a magnetic field is applied to it
a static field is applied to it
compression and expansion takes place
high frequencies
very high frequencies
very low frequencies
audio frequencies
no stable state
one stable state
two stable state
either one or two stable states
3 to 10 volts d.c.
1 to 5 volts d.c.
-5 to +5 volts d.c.
+5 to +15 volts d.c.
sine wave oscillator
square wave oscillator
saw-tooth wave oscillator
none of the stated above