Answer
$V_s=2.4V$
Work Step by Step
We know that
$\frac{V_s}{V_p}=\frac{N_s}{N_p}$
This can be rearranged as:
$V_s=V_p(\frac{N_s}{N_p})$
We plug in the known values to obtain:
$V_s=120(\frac{10}{500})=2.4V$
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