Question

Which among the following devices do not use current-
carrying conductors and magnetic fields?
a) Loud speaker
b) Microphone
c) Bulb
d) Measuring instrument​

Answer 1

D measuring instrument

Answer 2

Measuring instruments do not use current carrying conductors and magnetic fields.

• The loud speaker do use the current carrying conductors and the magnetic fields.
• The microphone do use the current carrying conductors and the magnetic fields.
• The bulb do use the current carrying conductors.
• The usage of current carrying conductors and magnetic fields are extremely rare and can be considered as almost none for the cases of the measuring instruments.