The voltage in the secondary coil is 20 V
Explanation:
The transformer equation gives the relationship between the voltage in the primary and secondary coil of a transformer:
where
is the voltage in the primary coil
is the voltage in the secondary coil
is the number of turns in the primary coil
is the number of turns in the secondary coil
It can also be rewritten as
In this problem, we have a step-up voltage that doubles the voltage, so:
The voltage in the primary coil is 10 V,
Therefore, the voltage in the secondary coil is
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