Answer
$\phi=2.45mWb$
Work Step by Step
We know that;
$\phi=NAB$
We plug in the known values to obtain:
$\phi=30(3.1416\times (0.10)^2)(2.60\times 10^{-3})=2.45\times 10^{-3}$
Therefore; $\phi=2.45\times 10^{-3}=2.45mWb$
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