The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an
A
carbon microphone
B
electric bells
C
magnetic relay
D
telephone earpiece
E
thermostat
Verified Correct Answer: E.
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #42855)