Answer
$3.8\times 10^3$
Work Step by Step
We know that
$N=(\epsilon)(\frac{\Delta t}{BA})$
We plug in the known values to obtain:
$N=6(\frac{1.8}{0.25\times \pi (\frac{0.12}{2})^2})$
$N=3.8\times 10^3$
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