Question

(iii) When a bar magnet is brought near iron dust, most of the dust sticks
(a) near the middle
(b) equally everywhere
(c) near two ends
(d) at the middle and ends

Answer 1

Answer:

Near two ends............

Answer 2

When a bar magnet is brought near iron dust, most of the dust sticks

(c) Near the two ends

Explanation:

• Since a bar magnet is rectangular both its ends strongly attract opposites charges and substances.
• The poles are North and South magnetic poles, they are highly charged.
• Both these poles exhibit strong magnetic attraction and are most likely to have substances clinging onto the poles rather than the entire bar magnet or its center.
• The magnetic field lines originate from the poles and move outward meeting the other pole.
• Hence the iron fillings are most attracted to the poles of the bar magnet.