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At a distance of 10 cm from a long stari...

At a distance of 10 cm from a long staright wire carrying a current I, the magnetic field is 0.04 T. At a distance of 40 cm from the wire, the magnetic field will be

A

`0.01 T`

B

`0.04 T`

C

`0.16 T`

D

`0.02 T`

Text Solution

Verified by Experts

The correct Answer is:
A
Here `r_1 = 10cm = 0.1 m, r_2 = 40 cm = 0.4 m and B_1 = 0.04 T`
`:. B_2 = (B_1 r_1)/(0.4) = 0.01 T`
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Knowledge Check

  • At a distance of 10 cm from a long straight wire carrying current, the magnetic field is 0.04 T . At the distance of 40 cm , the magnetic field will be

    A
    `0.01T`
    B
    `0.02 T`
    C
    `0.08 T`
    D
    `0.16 T`

  • At a distance of 10 cm from a long straight wire carrying current the magnetic field is 0.04 T. At the distance of 20 cm, the magnetic field will be

    A
    `0.01 T`
    B
    `0.02 T`
    C
    `0.08 T`
    D
    `0.16 T`

  • The magnetic field at a distance r from a long wire carrying current i is 0.4 T. The magnetic field at a distance 2r is

    A
    0.2 T
    B
    0.8T
    C
    0.1 T
    D
    1.6 T

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