Which of the following is not attracted by a magnet ?
(a) steel
(b) cobalt
(c) brass
(d) nickel
Which of the following is not a magnetic material?(a) gold(b) nickel(c) iron(d) cobalt
Answer the following questions.
(a) Classify the following substances as magnetic or non-magnetic.
copper, phosphorus, iron, cobalt, soil, water, silver mercury, nickel, wood, oil.
(b) In olden times, how as a magnet placed in a compass?
Why bar magnets always attract objects made of iron,cobalt and nickel rather than gold,silver?