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When 5 V potential difference is applied...

When 5 V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is `2.5 xx 10^(-4) ms ^(-1)`. If the electron density in the wire is ` 8 xx 10^(28) m^(-3)`, the resistivity of the material is close to :

A

`1.6 xx 10^(-6) Omega m`

B

`1.6 xx 10^(-5) Omega m`

C

`1.6 xx 10^(-8) Omega m`

D

`1.6 xx 10^(-7) Omega m`

Text Solution

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Knowledge Check

  • A potential difference of 5V is applied across a conductor of length 10 cm. IF drift of electron is 2.5 xx 10^(4) m//s , then electron mobility is SI unit is

    A
    `5 xx 10^(-4)`
    B
    ` 5 xx 10^(-6) `
    C
    `5 xx 10^(-2)`
    D
    Zero

  • A potential difference of 5 V is applied across a conductor of length 10 cm . If drift velcoity of electrons is 2.5 xx 10^(-4) m//s , then electron mobility will be

    A
    `5xx10^(-4) m^(2) V^(-1) S^(-1)`
    B
    `5 xx 10^(-6) m^(2) V^(-1) s^(-1)`
    C
    `5 xx 10^(-2) m^(2) V^(-1) s^(-1)`
    D
    Zero

  • When 115V is applied across a wire that is 10m long and has a 0.30mm radius, the current density is 1.4xx10^(4) A//m^(2) . The resistivity of the wire is

    A
    `2.0xx10^(-4)Omegam`
    B
    `4.1xx10^(-4)Omegam`
    C
    `8.2xx10^(-4)Omega m`
    D
    `2.0xx10^(-3)Omegam`
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