Pieces of aluminium (Al) and germanium (Ge) are cooled from T 1 K to T 2 K . The resistance of

Aluminium decreases and that of germanium increases

Aluminium increases and that of germanium decreases

EASY

Earn 100

Wire of resistance $R = 1 k ohm$ is heated by $100 °$ Celsius. Determine the change in its resistance if $α = 0.001 ° C^{- 1}$ .

Important Questions on Current Electricity

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

EASY

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

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

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

EASY

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

With the rise of temperature, the resistivity of a semiconductor

EASY

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

The resistance of a metal increases with increasing temperature because

EASY

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

Assertion: Resistivity of conductors and semiconductors increase with temperature.

Reason: The electrons move with more kinetic energy and hence relaxation time decreases.

EASY

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

When the temperature of a conductor increases by the current passing through it, the quantity or quantities which do not change is/are

EASY

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

Find the true statement from the following.

EASY

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

If the resistance of a conductor is

5 Ω

50 ° C

and

7 Ω

100 ° C

, then the mean temperature coefficient of resistance (of the material) is,

EASY

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

The specific resistance of a conductor increases with,

EASY

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

Pieces of aluminium (Al) and germanium (Ge) are cooled from

T_{1} K

T_{2} K

. The resistance of

EASY

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

The thermistors are usually made of

EASY

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

Assertion: The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.
Reason: On increasing the temperature, conductivity of metallic wire decreases.

EASY

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

Two different conductors have same resistance at

0^{°} C

. It is found that the resistance of the first conductor at

t_{1} ° C

is equal to the resistance of the second conductor at

t_{2} ° C

. The ratio of the temperature coefficients of resistance of the conductors,

\frac{α_{1}}{α_{2}}

EASY

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

A thermistor is dipped in a bath whose temperature is to be measured. When the temperature increases, the current also increases because of decrease in

EASY

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

Find the resistance of the wire at

30^{o} C,

if at

5^{o} C,

the resistance of same wire is

200 Ω a n d a t 10^{o} C,

the resistance of same wire is

200.2 Ω

EASY

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

The temperature co-efficient of resistance of a wire is

0.00125 ° C

. At

300 K

, its resistance is

1 Ω

. The resistance of the wire will be

2 Ω

at,

EASY

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

Assertion: With increase in temperature, resistance of a conducting wire increases.
Reason: With the increase in temperature, length and area of cross-section of wire changes, but resistivity remains constant.

HARD

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

The $V - I$ graphs for a conductor at temperatures $T_{1}$ and $T_{2}$ are shown in Fig. $5.193 .$ $R_{T_{2}} - R_{T_{1}}$ is proportional to

Question Image

EASY

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

A piece of Gold (Au) and Germanium (Ge) are cooled from room temperature to 77 K. Then the resistance of

Wire of resistance R=1k ohm is heated by 100° Celsius. Determine the change in its resistance if α=0.001 °C-1.

Important Questions on Current Electricity

Learn and Prepare for any exam you want !

Wire of resistance $R = 1 k ohm$ is heated by $100 °$ Celsius. Determine the change in its resistance if $α = 0.001 ° C^{- 1}$ .