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An air-solenoid has 500 turns of wire in...

An air-solenoid has 500 turns of wire in its 40 cm length. If the current in the wire be 1.0 ampere then the magnetic field on the axis inside the solenoid is -

A

15.7 gauss

B

1.57 gauss

C

0.157 gauss

D

0.0157 gauss

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Knowledge Check

  • A wire is wound on a long rod of material of relative permeability mu_(r) = 4000 to make a solenoid. If the current through the wire is 5 A and number of turns per unit length is 1000 per metre, then the magnetic field inside the solenoid is

    A
    `4 pi mT`
    B
    `8 pi mT`
    C
    `4 pi T`
    D
    `8 pi T`

  • A solenoid of length 50 cm and a radius of cros section 1 cm has 1000 turns of wire wound over it if the current carried is 5A the magnetic field on its axis near the centre of the solenoid is approximately (Given permeability of free space mu_(0)=4pi xx10^(-7) T-mA^(-1) )

    A
    `0.63xx10^(-2)T`
    B
    `1.26 xx10^(-2) T`
    C
    `2.51 xx10^(-2)T`
    D
    `6.3 T`

  • The magnetic field lines inside a current carrying solenoid are

    A
    parabolic
    B
    curved
    C
    straight
    D
    circular

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