6. Take a piece of Steel or Iron and magnetize it. Check it for its magnetization. Now demagnetize it and check it for its demagnetization. How did you do that?

Explain your experience with your observations. Draw the diagrams if necessary.

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.

the arctic is a region of the planet, north of the arctic circle, and includes the arctic ocean, greenland, baffin island, other smaller northern islands, and the far northern parts of europe, russia (siberia), alaska and canada.