is the surest test which confirms that the given piece of the object is a magnet. 1.Rotation
2.Repulsion
3.None of these
4.Refraction

2. Repulsion

Explanation:

number two is the answer

Repulsion is the surest test which confirms that the given piece of the object is a magnet.

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

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