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Draw a graph representing the change in specific resistance with temperature. |
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Answer» SOLUTION :Let a' be the coefficient of linear expansion and a be the temperature coefficient of resistance of the material of the conductor. IF the resistivity of the material of the conductor at `0^@C` and `t^@C` and `rho_0` and `rho` respectively then, `rho=rho_0[1+(a+a')t]` or,`rho=rho_0(a+a')t+rho_0` IT is similar to the general EQUATION of straight line i.e., `y=mx+c` `rho-t` plot is SHOWN in the fig.1.101 
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