A horizontal rectangular surface has dimensions $3\mathrm{.}10$ cm by $3\mathrm{.}70$ cm and is in a uniform magnetic field that is directed at an angle of $31\mathrm{.}0$

above the horizontal.

Part A

What must the magnitude of the magnetic field be to produce a flux of $4\mathrm{.}00$

$104$ Wb

through the surface?

Express your answer with the appropriate units.

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B

$=$

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