Two materials A and B have resistance temperature coefficients 0.004 and 0.0004 per °C respectively at a given temperature. In what proportion should A and B be joined in series to produce a circuit having a temperature coefficient of 0.001.
The formula for the change in resistance is typically given by R_T = R_0(1 + \alpha \Delta T), where R_T is the resistance at temperature T, R_0 is the resistance at a reference temperature T_0, and \Delta T = T - T_0. Therefore, the correct answer is 1 ∶ 5.
Important Questions from Circuit Elements
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