Question

Jack dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filing got stuck to the magnet as shown in figure.
(a) Which regions of the magnet have more iron filings sticking to it and what are these regions called?
(b) Define Magnetic Field.​

Answer 1

Answer:

What is the frequency of an object if it vibrates 20 times in 20 seconds?

Answer. therefore Frequency = 20 oscillations per second = 20 hz.