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Iron cores or rods are used in solenoids to increase the strength of the magnetic field produced when an electric current flows through the coil. Iron has high magnetic permeability, which means it can easily magnetize and demagnetize, enhancing the efficiency of the electromagnet. This allows the solenoid to exert a stronger force over a shorter distance.

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Q: Why are iron cores or rods used in solenoids that act as electromagnets?
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