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Calulate Flux

APPHEM-A3WDYD

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.

A

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

B

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

C

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

D

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

E

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