The speaker consists of ………
a) round permanent magnet
b) electromagnet
c) bar magnet
d) both a and b
Which of the following magnet is/are attached to paper cone in speakers?
a) round permanent magnet
b) electromagnet
c) bar magnet
d) both a and b
The cone of speaker vibrates with varying the magnitude of the……..
a) voltage
b) current
c) coil
d) all of these
Speaker converts electrical energy into which of the following form of energy?
a) sound
b) light
c) heat
d) all of these
Electric Bell:
Electric bell is based on the principle of electromagnets. When switch is pressed, electromagnet is activated and the hammer moves and hits the gong. As the hammer moves, circuit breaks and the electromagnet is disabled.
Which of the
following magnet is/are used in electric bell?
a) round permanent magnet
b) electromagnet
c) bar magnet
d) both a and b
