Question

The following properties belong to which magnet?
a. Made of soft iron.
b. Strength of magnetic field can be changed.
c. Strong magnetic field but can be easily demagnetized
d. Polarity can be reversed

• A. Permanent magnet
• B. Bar magnet
• C. Electro-magnet
• D. Horse-shoe magnet

Answer 1

The correct option is C Electro-magnet

An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet and loses its magnetism when the current is removed. The magnitude of magnetic field can be altered by increasing or decreasing the current. Also the polarity can be reversed by changing the direction of current.