All these are devices that uses
electromagnet in its mode of
operation EXCEPT____
A. Cell phone
B. Transformers
C. Microphone
D. Induction coil
A. Cell phone
To determine which of the given options does not use an electromagnet in its mode of operation, we need to examine each option one by one.
A. Cell phone: Cell phones incorporate several components, including speakers and vibration motors, which rely on electromagnets for their functioning.
B. Transformers: Transformers are devices designed to transfer electrical energy between two or more circuits using electromagnetic induction. They definitely use electromagnets as part of their operation.
C. Microphone: Microphones convert sound waves into electrical signals and rely on various types of transducers, such as dynamic microphones or condenser microphones that utilize electromagnets.
D. Induction coil: Induction coils are specifically designed to produce high-voltage pulses using electromagnetic induction. They consist of a core with multiple windings of wire, which create an electromagnetic field.
Based on this analysis, it is clear that all the given options (A, B, C, and D) use electromagnets in their mode of operation. Therefore, the correct answer is that there is no device listed that does not use an electromagnet in its mode of operation.