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A current is passed through a steel wire...

A current is passed through a steel wire heated to red. Then half of the wire is immersed in cold water. Which half of the wire will heat up more and why?

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The half part of wire immersed in cold water is at lower temperature, so its resistance is less than that of unimmersed part. The net resistance of wire will decrease and so the current will increase. The resistance of exposed part is same as before therefore the heat produced`(I^2r)` in exposed part is increased, hence the exposed part of the wire is heated up still more.
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