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The strength of the magnetic field at a ...

The strength of the magnetic field at a point `r` near a long straight current carrying wire is `B`. The field at a distance `r/2` will be

A

`B/2`

B

`B/4`

C

`2B`

D

`4B`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • The strength of the magnetic field around a long straight wire, carrying current, is

    A
    inversely proportional to the distance from the wire
    B
    inversely proportional to the square of the distance from the wire
    C
    directly proportional to the square of the distance
    D
    directly proportional to the distance from the wire

  • The strength of the magnetic field around a current-carrying straight conductor

    A
    is same every where around the conductor.
    B
    is directly proportional to the square of distance of a point from the conductor.
    C
    is directly proportional to the current flowing in the conductor.
    D
    is inversely proportional to the current

  • 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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    Consider the magnetic field produced by a finitely long current carrying wire .

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