Your cart is empty.
Practice each question, then open the answer or worked solution.
Fill in the blanks
(i) When a bar magnet is broken; each of the broken parts will have ................ pole/poles.
(ii) In a bar magnet, magnetic attraction is ............... near its ends.
Ans: Fill in the blanks- (i) two. (ii) more.
Paheli and her friends were decorating the class bulletin board. She dropped the box of stainless steel pins by mistake. She tried to collect the pins using a magnet. She could not succeed. What could be the reason for this?
Ans: Stainless steel is typically non-magnetic, meaning it is not attracted to magnets. Magnets are exclusively attracted to metals with magnetic properties, such as nickel, iron, and cobalt.
How will you test that, 'tea dust' is not adulterated with iron powder?
Ans: We can use a magnet to detect iron powder impurities in tea dust. If there is iron powder in the 'tea dust', it will get attracted to the magnet, and if there is no iron dust, the magnet will be clear.
Boojho dipped a bar magnet in a heap of iron filings and pulled it out. He found that iron filings got stuck to the magnet, as shown in Fig. 13.4.
Fig. 13.4
(i) Which regions of the magnet have more iron filings sticking to it?
(ii) What are these regions called?
Ans: (i) The strength of the magnet is concentrated at its ends so that the poles will have more filings on them.
(ii) These regions are termed as 'South pole' and 'North pole'.