Question

Mention 2 advantages of electromagnet over a permanent magnet . What type of magnet is used in electric bulb? Draw a labelled diagram and explain the working of electric bell .

Answer 1

State any two advantages of electromagnets over permanent magnets.

Two advantages of electromagnets over permanent magnets are :

1. The magnetic strength of electromagnets can either be increased or decreased but this cannot be done in permanent magnets.
2. Magnetic power of electromagnets is more than compared to permanent magnets.

What type of magnet is used in electric bulb?

the large U-shaped magnets.

Draw a labelled diagram and explain the working of electric bell .

An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or using electrical energy to cause chemical reactions. The electrochemical cells which generate an electric current are called voltaic cells or galvanic cells and those that generate chemical reactions, via electrolysis for example, are called electrolytic cells.

❤BTS AND EXO❤

Answer 2

Answer:

Two advantages of electromagnet over a permanent magnet are:

1. the magnetic field can be quickly changed by controlling the amount of electric current in the winding.
2. Magnetic power of electromagnets is more than compared to permanent magnets.