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Answer :
The correct options are (a &b) .
- The strength of the electromagnet will vary depending on the core material utilized if cores of various materials with the same physical dimensions are employed.
- The number of flux lines traveling through the central core is what causes this difference in magnetic intensity.
a. Replacing the steel core of the magnet with a plastic core
- No, Steel is used in permanent magnets because it takes a long time to get magnetized and remains magnetized after the current is turned off.
- In contrast, soft iron almost instantly acquires magnetism when the current is turned on, and it quickly loses all of its magnetism when the current is turned off.
B. Decreasing the number of wraps of wire
- As the number of turns increases the number of paper clips held increase.
- This means that the strength of the magnet increases with increasing number of turns in the coil.
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