Copper and Silicon are cooled from 300 K to 60 K . The specific resistance

decreases in copper but increases in silicon

increases in copper but decreases in silicon

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The positive temperature coefficient of resistance is for;

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Important Questions on Current Electricity

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

$I$ and $V$ are respectively the current and voltage in a metal wire of resistance $R .$ The $I - V$ graph for the two different temperatures $T_{1}$ and $T_{2}$ are given, then

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EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The resistance of a wire at

20 ° C

20 Ω

and

500 ° C

60 Ω

. At which temperature, its resistance will be

25 Ω ?

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

A piece of copper and another of germanium are cooled from room temperature to

77 ° K .

The resistance of

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The resistance of the platinum wire of a platinum resistance thermometer at the ice point is

5 Ω

and at steam point is

5.23 Ω

. When the thermometer is inserted in a hot bath, the resistance of the platinum wire will be

5.795 Ω

. Calculate the temperature of the bath.

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The conductivity of semiconductor increases with increase in temperature because

HARD

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The resistance of a conductor at

15 ° C

16 Ω

and at

100 ° C

20 Ω .

What will be the temperature coefficient of resistance of the conductor?

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The temperature co-efficient of resistance of a wire is

0.00125 / ° C .

Its resistance is

1 Ω

300 K .

At what temperature, its resistance will be

2 Ω

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Copper and Silicon are cooled from

300 K

60 K

. The specific resistance

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

In a platinum resistance thermometer, the resistances of the wire at ice point and steam point are of

4 Ω

and

4.25 Ω

respectively. When the thermometer is kept in a hot water bath, whose temperature is not known, the resistance of the wire is found to be

4.5 Ω .

The temperature of the hot water bath is

MEDIUM

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Which of the following graph represents the variation of resistivity

(ρ)

with temperature

(T)

for copper?

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

What will be the resistance of a wire at 0 degree celsius, if its resistance is

5 ohm

50

degree celsius and

6 ohm

100

degree celsius?

EASY

Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The temperature dependence of resistance of

Cu

and undoped

Si

in the temperature range

300 - 400 K

is best described by

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The temperature

(T)

dependence of resistivity

(ρ)

of a semiconductor is represented by

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

When the temperature of a conductor increases, the ratio of conductivity and resistivity _____

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Constantan wire is used in making standard resistances because its

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

A piece of copper and another of germanium are cooled from room temperature to

80 K

. The resistance of...

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

Which of the following quantities does not change when a resistor is heated by passing current through it?

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

The solids which have the negative temperature coefficient of resistance are:

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.

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One may conclude that

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Physics>Electricity and Magnetism>Current Electricity>Temperature Dependence of Resistivity

A heating element has a resistance of

100 Ω

at room temperature. When it is connected to a supply of

220 V

, a steady current of

2 A

passes in it and temperature is

500^{o} C

more than the room temperature. The temperature coefficient of resistance of the heating element is

The positive temperature coefficient of resistance is for;

Important Questions on Current Electricity

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