Question

Complete the given statement, the strength of an electromagnet can be:

• A. increased by adding a ferromagnetic core
• B. decreased by adding turns of wire to the coil
• C. increased by reducing the current through the wire
• D. increased by adding an aluminum core
• E. decreased by adding more layers of wire to the coil

Answer 1

The correct option is A increased by adding a ferromagnetic core

A ferromagnetic substance get highly magnetized when put in a magnetic field. When the ferromagnetic core is added to the electromagnet then the total field is the sum of the field because of electromagnet and because of the highly magnetized core.