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Nichrome and copper wires of same length...

Nichrome and copper wires of same length and area of cross-section are connected in sereis, current is passed through them. Why does the nichrome wire get heated first ?

Text Solution

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In series connection, current through the two wires is the same. The heat produced in wire due to current is `H = I^(2)Rt`. For the given current I and time t, `H prop R`.
Also `R = (rho L)/A`
For the given value of l A, `R prop rho :. H prop rho`
Since resistivity of nichrome is greater than that of copper, hence heat produced in nichrome wire will be more than that of copper wire.
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