# NEET Physics Current Electricity Questions Solved

Two wires of resistance R1 and R2 have temperature coefficient of resistance , respectively. These are joined in series. The effective temperature coefficient of resistance is

(1) $\frac{{\alpha }_{1}+{\alpha }_{2}}{2}$

(2) $\sqrt{{\alpha }_{1}{\alpha }_{2}}$

(3) $\frac{{\alpha }_{1}{R}_{1}+{\alpha }_{2}{R}_{2}}{{R}_{1}+{R}_{2}}$

(4) $\frac{\sqrt{{R}_{1}{R}_{2}{\alpha }_{1}{\alpha }_{2}}}{\sqrt{{R}_{1}^{2}+{R}_{2}^{2}}}$

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