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A long straight wire carries a current of `35A`. What is the magnetic of the field `vecB` at a point `20cm` from the wire?

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Here, `I=35A`, `r=20cm=20xx10^-2m`, `B=?`
`B=(mu_0)/(4pi)(2I)/(r)=10^-7xx(2xx35)/(20xx10^-2)=3*5xx10^-5T`
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