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A long solenoid has 20 turns per cm and ...

A long solenoid has 20 turns per cm and carries a current i. the magnetic field at its centre is `6.28xx10^(-2)Wb//m^(2)`. Another long solenoid has 100 turns per cm and it carries a current `i//3` . The value of the magnetic field at its centre is

A

`1.05xx10^(-2)Wb//m^(2)`

B

`1.05xx10^(-3)Wb// m^(2)`

C

`1.05xx10^(-3)Wb//m^(2)`

D

`1.05xx10^(-4)Wb//m^(2)`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A long solenoid has 200 turns per cm and carries a current 1. The magnetic field at its centre is 6.28 xx 10^(-2) Wb m^(-2) . Another long solenoid has 100 turns per cm and it carries a current 7"/"3 . The value of the magnetic field at its centre is

    A
    `1.05xx10^(-4)Wbm^(-2)`
    B
    `1.05xx10^(-2)Wbm^(-2)`
    C
    `1.05xx10^(-5)Wbm^(-2)`
    D
    `1.05xx10^(-3)Wbm^(-2)`

  • A long solenoid has 200 turns per cm and carries a current i . The magnetic field at its centre is 6.28xx10^(-2) weber//cm^(2) . Another long soloenoid has 100 turns per cm and it carries a current (i)/(3) . The value of the magnetic field at its centre is

    A
    `1.05 xx 10^(-2) Weber//m^(2)`
    B
    `1.05 xx 10^(-5) Weber//m^(2)`
    C
    `1.05 xx 10^(-3) Weber//m^(2)`
    D
    `1.05 xx 10^(-4) Weber//m^(2)`

  • A long solenoid has 200 turns per cm and carries a current of 2.5A. The magnetic field at its centre is

    A
    `3.14xx10^-2Wb//m^2`
    B
    `6.28xx10^-2Wb//m^2`
    C
    `9.42xx10^-2Wb//m^2`
    D
    `12.56xx10^-2Wb//m^2`

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