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Magnetic Effects of Electric Current

The magnetic ...

Question

The magnetic field of an electromagnet may be hundreds of times stronger than the magnetic field of just the solenoid. Explain, why ?

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Solution

An electromagnet is a combination of a solenoid and a core that is magnetized when current is passed through it.
The magnetic field produced by electromagnet is equal to the sum of that of solenoid and the magnetized core.
As a result, magnetic field of an electromagnet becomes hundreds time stronger than that of just the solenoid.

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