Home
Class 12
PHYSICS
The resistance R of a conducting wire de...

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is `rho=(RA)l` the value of `rho` is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is `R_0` at `0^@C` and `R_1` at `t^@C`, then `R_1=R_0(1+at)` where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium.
The resistance of a metal wire increases by 10% when its temperature rises from `10^@C` to `110^@C`.The temperature coefficient of resistance of the metal is

A

`0.02^@C^-1`

B

`0.01^@C^-1`

C

`0.002^@C^-1`

D

`0.001^@C^-1`

Text Solution

Verified by Experts

The correct Answer is:
D
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise ENTRANCE CORNER(INTEGER ANSWER TYPE)|5 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise EXAMINATION ARCHIVE WITH SOLUTIONS(WBCHSE)|18 Videos

  • CURRENT ELECTRICITY

    CHHAYA PUBLICATION|Exercise ENTRANCE CORNER(MULTIPLE CORRECT ANSWERS TYPE)|5 Videos

  • COMMUNICATION STSTEM

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|28 Videos

  • DIFFRACTION AND POLARISATION OF LIGHT

    CHHAYA PUBLICATION|Exercise CBSE SCANNER|27 Videos

Similar Questions

Explore conceptually related problems

How the resistance of conductor depends on its length and area of cross-section ?

How does the resistance of a conductor depend on its length and cross sectional area?

Knowledge Check

  • The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/t the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The temperature coefficient of resistance of a semiconductor is

    A
    zero
    B
    positive
    C
    negative
    D
    positive or negative depending on the material

  • The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/l the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The length of this metal wire is doubled by stretching .What will be the change in its resistance?

    A
    100% increase
    B
    200% increase
    C
    300% increase
    D
    500% increase

  • The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/t the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The temperature of this new wire is again raised from 10^@C to 110^@C The percentage increase of his resistance would be

    A
    0.05
    B
    0.1
    C
    0.2
    D
    0.4

    • Similar Questions

    Explore conceptually related problems

    Name any one material having a small value of temperature coefficient of resistance.Write one use of this material.

    The resistivity of a wire if its length be doubled-

    Two conducting wires of lenghts l and 2l have the same cross-sectional area.Compare their resistances.

    A wire has a resistanceof 2 ohm at 273 K and a resistance of 2.5 ohm at 373 K. What is the temperature coefficient of resistance of the material ?

    When the length and area of cross-section of a wire are doubled, then its resistance

    Home
    Profile