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The magnetic induction at any point due ...

The magnetic induction at any point due to a long straight wire carrying a current is

A

Proportional to the distance from the wire

B

Inversely proportional to the distance from wire

C

Inversely proportional to the square of the distance from the wire

D

Does not depend on distance

Text Solution

Verified by Experts

The correct Answer is:
B
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The magnetic induction at 0.1 m from a very long straight wire carrying a current of 5A is 10^(-6) Wb//m^(2) . What will be the magnetic induction at 0.2 m from the wire if the current through it is increased to 20 A?

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Knowledge Check

  • The magnetic induction due to an infinitely long straight wire carrying a current i at a distance r from wire is given by

    A
    `|B|=((mu_(0))/(4pi))(2i)/r`
    B
    `|B|=((mu_(0))/(4pi))r/(2i)`
    C
    `|B|=((4pi)/(mu_(0)))(2i)/r`
    D
    `|B|=((4pi)/(mu_(0)))r/(2i)`

  • What is the magnetic induction at a distance of 5 cm from a straight wire carrying a current of 5 mA ?

    A
    `4xx10^(-8)Wb//m^(2)`
    B
    `3xx10^(-8)Wb//m^(2)`
    C
    `2xx10^(-8)Wb//m^(2)`
    D
    `5.5 xx10^(-8)Wb//m^(2)`

  • A field due to a long straight wire carrying a current I is proportional to

    A
    l
    B
    `l^(2)`
    C
    `l^(3)`
    D
    `sqrtl`

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