Temperature coefficient of resistivity (alpha) is negative and positive for the ........materials

The temperature coefficient of resistivity of material is 0.0004/k. When the temperature of the material is increased by 50^(@)C , its resistivity increases by 2 xx 10^(-8) ohm-m. The initial resistivity of the material in ohm-m is

Two metallic wires. A and B of equal dimensions but made of different materials, having resistivities p and 2p temperature coefficients of resistivities 2aipha and alpha , are connected in series. The temperature coefficient of resistance of the composite wire equals

There is a cylindrical wire whose temperature coefficient of resistivity is 6 times 10^-3^@C^-1 and co-efficient of linear expansion in 10^-3^@C^-1 . Its temperature coefficient of resistance is N times 10^-3^@c^-1 . Then, the value of N is:

Define temperature coefficient of resistance of the material of a conductor.

The temperature coefficient of resistance of an alloy used for making resistor is

A resistance R of therimal coefficient of resistivity alpha is connected in parallel with a resistance 3R. Having thermal coeffiecinet of resistivity 2alpha Find the value of alpha_(eff)

Coefficient of linear expnsion of material of resistor is alpha . Its temperature coefficient of resistivity and resistance are alpha_(p) and alpha_(R) respectively , the correct relation is .

Assertion: the value of temperature coefficient of resistance is positive is for metals. Reason: The temperature coefficient of resistance for insulator is also positive.

Two resistance R_(1) and R_(2) are made of different material. The temperature coefficient of the material of R_(1) is alpha and of the material of R_(2) is -beta . Then resistance of the series combination of R_(1) and R_(2) will not change with temperature, if R_(1)//R_(2) will not change with temperature if R_(1)//R_(2) equals

Two resistance R_(1) and R_(2) are made of different material. The temperature coefficient of the material of R_(1) is alpha and of the material of R_(2) is -beta . Then resistance of the series combination of R_(1) and R_(2) will not change with temperature, if R_(1)//R_(2) will not change with temperature if R_(1)//R_(2) equals