Question

Tom mixed some board pins with sawdust while doing his school project. How can he separate board pins from the sawdust without picking with his hands?

Answer 1

Answer:

by use of horse shoe magnet

board pin will be attracted by magnet

Answer 2

Seperation can be done with the help of magnet.

On exposure to magnet, magnetic field aligns the electrons of iron, thus attracting it.

Saw dust being a wood shaving, is made of non conductor of electricity.

Here the arrangement of electrons is so random, that alignment can not take place.

Hence, it does not attract to iron. Thus, with magnet, seperation can be done without picking the two components by hand.