In a step-up transformer,the transformation ratio is $4:1$. If a Leclanche cell having an $EMF$ of $1.5 \ V$ is connected to the primary coil of the transformer,then the voltage obtained across its secondary coil is . . . . . . .
- A$1.5 \ V$
- B$3 \ V$
- C$6 \ V$
- DZero
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