At a typical location in the United States, the earth's magnetic field has a magnitude of (5.0

Question:

At a typical location in the United States, the earth's magnetic field has a magnitude of $5.0 \times 10^{-5} \mathrm{~T}$ and is at a $65^{\circ}$ angle from the horizontal. What is the flux through the $22 \mathrm{~cm} \times$ $28 \mathrm{~cm}$ front cover of your textbook if it is flat on your desk?

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