Question $1$

$(1$ points$)$

A long, straight, horizontal wire carries a left$-$to$-$right current of $20$ A $.$ If the wire is placed in a uniform magnetic field of magnitude $4\mathrm{.}0{10}^{-5}T$ that is directed vertically downward, what is the resultant magnitude of the magnetic field $20$ cm above the wire?

Select the correct answer

$7\mathrm{.}1{10}^{-5}T$

$2\mathrm{.}5{10}^{-4}T$

$4\mathrm{.}5{10}^{-5}T$

$9\mathrm{.}0{10}^{-5}T$

$4\mathrm{.}0{10}^{-4}T$

No answer

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