The figure shows a simple electromagnet made of a coil of insulated wire wrapped around an iron nail.When the switch closed, which of the following will make this electromagnet stronger? (i) increasing the number of coils(ii) adding more turns to the coil(iii) increasing the direct current flowing through the coil(iv) changing the direct current flowing through the coil to alternating current.*1 point
Question
The figure shows a simple electromagnet made of a coil of insulated wire wrapped around an iron nail.When the switch closed, which of the following will make this electromagnet stronger? (i) increasing the number of coils(ii) adding more turns to the coil(iii) increasing the direct current flowing through the coil(iv) changing the direct current flowing through the coil to alternating current.*1 point
Solution
The strength of an electromagnet can be increased by:
(i) Increasing the number of coils: More coils mean a stronger magnetic field, thus making the electromagnet stronger.
(ii) Adding more turns to the coil: This is essentially the same as increasing the number of coils. More turns mean a stronger magnetic field, thus making the electromagnet stronger.
(iii) Increasing the direct current flowing through the coil: The strength of the magnetic field produced by an electromagnet is directly proportional to the current flowing through the coil. Therefore, increasing the current will make the electromagnet stronger.
(iv) Changing the direct current flowing through the coil to alternating current: This will not make the electromagnet stronger. In fact, it will cause the magnetic field to constantly change direction, which is not desirable in an electromagnet. Therefore, this option will not make the electromagnet stronger.
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