5 A current is flowing through a long straight conducting wire. What is the magnitude of magnetic field at a distance 10 cm from the wire ?

Explanation

We know, `B=(mu_(0))/(4p)*(2I)/(r)` [m for straight infinite wire]
Here, `I=5A, r=10 cm=0.1 m, mu_(0)=4pixx10^(-7)H*m^(-1)`
`:.B=(4pixx10^(-7))/(4pi)xx(2xx5)/(0.1)=10^(-5)Wb*m^(-2)`