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A $2.7\text{ A}$ current is flowing through a straight wire.

What is the strength of the magnetic field $31\text{ cm}$ from the wire?

A

$1.7\times10^{-6}\text{ T}$

B

$8.7\times10^{-7}\text{ T}$

C

$2.3\times10^{-8}\text{ T}$

D

$5.6\times10^{-6}\text{ T}$

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