Physics
Grade-10
Easy
Question
The coil of an electric motor is made up of ________ wire.
- Iron
- Plastic
- Copper
- Tungsten
Hint:
Copper
The correct answer is: Copper
Copper is the most common magnet wire choice due to its high conductivity and relatively low cost. For most motors, we use copper with a very thin enamel coating and tightly wrap the wire to create the winding that will build the electromagnetic field to drive the motor.
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Which of the following actions will decrease the strength of the magnetic field of an electromagnet?
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(i) Electromagnets can be made more powerful than ordinary bar magnets.
(ii) Soft iron core is used in electromagnets
(iii) The poles of an electromagnet are not affected by the direction of the current.
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Study the statements given below:
(i) Electromagnets can be made more powerful than ordinary bar magnets.
(ii) Soft iron core is used in electromagnets
(iii) The poles of an electromagnet are not affected by the direction of the current.
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