Two coils connected in series have resistances of and at

PHYSICS · Multi-part · A Level · Physics · Electricity · Electricity

Problem

Two coils connected in series have resistances of

600\ \Omega

and

300\ \Omega

20^\circ\text{C}

, and temperature coefficients of

0.001\ ({}^\circ\text{C})^{-1}

and

0.004\ ({}^\circ\text{C})^{-1}

, respectively. Find the resistance of the combination at

50^\circ\text{C}

. What is the effective temperature coefficient of the combination? (a) Resistance of the combination at

50^\circ\text{C}

. (b) Effective temperature coefficient of the combination.