GEOLOGY

Detailed explanation-1: -The correct option is an electromagnet. EXPLANATION: Solenoid. It is a long straight coil of wire that can be used to generate a nearly uniform magnetic field similar to that of a bar magnet.

Detailed explanation-2: -A solenoid with a ferromagnetic core is called an electromagnet. Both the current in the wire and the magnetized core produce the magnetic field of an electromagnet.

Detailed explanation-3: -Electromagnets. A solenoid with an iron core is called an electromagnet . The iron core increases the solenoid’s magnetic field strength.

Detailed explanation-4: -A solenoid is a type of electromagnet where the coil is usually tightly wound and tends to be longer than its diameter, but it could be any shape. The magnetic field created by electrical currents is very similar to the magnetic field created by bar magnets. In the solenoid, the field is uniform and strong.

Detailed explanation-5: -An electromagnet is a solenoid wrapped around a bar of iron or other ferromagnetic material. The magnetic field of the solenoid magnetizes the iron bar. The combined magnetic force of the magnetized wire coil and iron bar makes an electromagnet very strong.