Question

under what condition permanent Electromagnet is obtained if a current carrying solenoid is used support your answer with the help of a labelled circuit diagram​

Answer 1

Answer:

Answer: The conditions to obtain permanent electromagnet as following if a current carrying solenoid is used are (i) The current through the solenoid should be direct current. (ii) The rod inside is made of a magnetic material such as steel.

Answer 2

$\star$ A permanent electromagnet is obtained under the following conditions if a current carrying solenoid is used:

• The core of the the current carrying solenoid must contain metallic core (like steel or iron) with the high capability to retain magnetic properties a long time after magnetization. Hence a metallic core with high permeability $(\mu)$ is preferred.

• The current passing through the wires of the solenoid must be direct current (DC) such that the polarities of the electromagnet does not change with time.

• The solenoid must consist of closely packed, large number of wire coils in order to produce a strong magnetic field passing through the metallic core.

Refer to attached diagram.