If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water ______.

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If a watch-glass containing a small quantity of water is placed on two dissimilar magnetic poles, then water shows a depression in the middle. Explanation: When a watch glass containing water is placed over two dissimilar magnetic poles (such as north and south poles placed close to each other), a non-uniform magnetic field is created. Water is a diamagnetic substance, meaning it is weakly repelled by a magnetic field. In a non-uniform magnetic field: • The water molecules are repelled away from the region of stronger magnetic field. • Since the magnetic field is strongest near the poles and weaker at the centre between them, the water is pushed outward. • This causes the water surface to dip in the centre, forming a depression.

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