\textbf{189-} A loop with area $200\,\text{cm}^2$ is placed inside a uniform magnetic field of magnitude $B = 0.004\,\text{T}$, and the field lines make an angle of $60°$ with the plane of the loop. What is the magnetic flux through the loop?
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(1) $7\times10^{-5}$ \hfill (2) $4\times10^{-5}$ \hfill (3) $4\sqrt{3}\times10^{-5}$ \hfill (4) $4\sqrt{3}\times10^{-5}$
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