Two wires of resistance `R_(1)` and `R_(2)` have temperature coefficient of resistance `alpha_(1)` and `alpha_(2)` respectively. These are joined in series. The effective temperature coefficient of resistance is

Two wires of resistance R_(1) and R_(2) have temperature coeficient of resistance alpha_(1) and alpha_(2) respectively. These are joined in series. The effeictive temperature coefficient of resistance is

The positive temperature coefficient of resistance is for

The temperature coefficient of resistance of a conductor is

The temperature coefficient of resistance of a semiconductor

The solids which have negative temperature coefficient of resistance are:

The temperature coefficient of resistance of a semi conductor is

Two equal resistance at 0^(@)C with temperature coefficient of resistance alpha_(1) and alpha_(2) joined in series act as a single resistance in a circuit the temperature coefficient of their single resistance will be

Two different wirese having lengths L_(1) and L_(2) and respective temperature coefficient of linear expansion alpha_(1) and alpha_(2) are joined end - to - end . Then the effective temperature coeficient of linear expansion is :