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A current l is flowing through a long st...

A current l is flowing through a long straight solid conductor of radius R = 4 cm. Magnetic field at a distance 2 cm from the axis of conductor is `B_0` The distance from the axis, where magnetic field is 1.5 `B_0` is (current density is uniform)

A

3 cm

B

`16/3` cm

C

6 cm

D

Both (1) and (2)

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Knowledge Check

  • Current flows through a straight, thin-walled tube of radius r. The magnetic field at a distance x from the axis of the tube has magnitude B.

    A
    `B prop x`, for 0 lt x lt r
    B
    `B prop 1//x` , for 0 lt x lt r
    C
    B=0 , for `0 le x lt r`
    D
    B=0 , only for x=0

  • 20 ampere current is flowing in a long straight wire. The intensity of magnetic field at a distance 10 cm from the wire will be

    A
    `4xx10^(-5)Wb//m`
    B
    `9xx10^(-5)Wb//m`
    C
    `8xx10^(-5)Wb//m`
    D
    `6xx10^(-5)Wb//m`

  • Variation of magnetic field with distance from current carrying conductor is:

    A
    `B prop a^(2)`
    B
    `B prop (1)/(a^(2))`
    C
    `B prop a`
    D
    `B prop (1)/(a)`