A watch glass containing some powdered substance is placed between the pole pieces of a magnet. Deep concavity is observed at the center. The substance in the watch glass is (assume poles are far)
iron
carbon
wood
chromium
A
carbon
B
chromium
C
wood
D
iron
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Solution
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The substance in the watch glass is iron since it is ferromagnetic material (with positive charge on it) hence when kept in between two pole pieces it will attracted by negative one and repelled by positive one and deep concavity is observed at the center.
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