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At what distance from a long straight wi...

At what distance from a long straight wire carrying current of 12A will be the magnetic field be the equal to `3xx10^(-5) (Wb)//(m^(2))` ?

A

`8xx10^(-2)m`

B

`12xx10^(-2)m`

C

`18xx10^(-2)m`

D

`24xx10^(-2)m`

Text Solution

Verified by Experts

The correct Answer is:
A
`B=((mu_(0))/(4pi))((2I)/(r))therefore3xx10^(-5) =10^(-7)xx(2xx12)/(r)`
`therefore r =(24xx10^(-7))/(3xx10^(-5))=8xx10^(-2)m`
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