GEOLOGY

Detailed explanation-1: -The magnetic field of an electromagnet may be hundreds of times stronger than the magnetic field of just the solenoid.

Detailed explanation-2: -A core of ferromagnetic material like iron serves to increase the magnetic field created. The strength of magnetic field generated is proportional to the amount of current through the winding.An electromagnet can produce very strong magnetic force as compared to permanent magnet.

Detailed explanation-3: -To concentrate the magnetic field, in an electromagnet the wire is wound into a coil with many turns of wire lying side by side. The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there.

Detailed explanation-4: -Both solenoids and electromagnets use electric current and coiled wires to produce strong magnetic fields.