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Magnetic field at 10 cm from extremely l...

Magnetic field at 10 cm from extremely long current carrying straight wire is `10^(-5)Wb//m^(2)`. Then current passing through this wire is ______ .

A

5A

B

10A

C

500A

D

1000A

Text Solution

Verified by Experts

The correct Answer is:
A
`mu_(0)=4pixx10^(-7)Tm//A`
`B=10^(-5)Wb//m`
`y=10xx10^(-2)m`
`B=(mu_(0)I)/(2piy)rArrI=(Bxx2piy)/mu_(0)`
`thereforeI=(10^(-5)xx2pixx10xx10^(-2))/(4pixx10^(-7))=5A`
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