Q7 of 44 Page 428

The material of the core of a strong electromagnet is:

As we know that soft iron gets magnetized easily and it can retain its magnetization for a longer time, that is why it is used in electromagnets.

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5

A soft iron bar is introduced inside a current carrying solenoid. The magnetic field inside the solenoid:

 6

Inside a current carrying solenoid the magnetic lines of force are:

 8

The direction of induced potential difference is given by:

 9

The principle of which of these devices is electromagnetism: