A step-up transformer is used on a 120V ...

A step-up transformer is used on a 120V line to provide a potential difference of 240V, if the primary coil has 75 turns the number of turns in the secondary coil is ……..

150

1200

1500

1575

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The correct Answer is:

`epsilon_1`=120 V, `epsilon_2`= 240 V, `N_1`= 75 , `N_2` = ?
`epsilon_2/epsilon_1=N_2/N_1`
`therefore 240/120=N_2/75`
`therefore N_2`= 150

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