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A conducting loop of radius $R$ is has a $B$-field directed through it at a downward angle as shown. Determine the amount of flux in the loop.

$ \cfrac{B\pi R^{2}}{\cos\theta } $

$ \cfrac{B\pi R^2}{\sin \theta} $

$ B \pi R^2 \sin \theta $

$ B \pi R^2 \cos \theta $

$ B \pi R^4 \cos \theta$