What is the purpose of the metal core in an electromagnet?
A) It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
B) It is magnetized and induces a current in the solenoid to increase the magnetic field strength.
C) It is magnetized by the field of the solenoid and increases the magnetic field strength.
D) It is magnetized by the field of the solenoid and decreases the magnetic field strength.
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