Solution-What voltage appears across the primary coil of

A step-down transformer produces a voltage of 6.9V across the secondary coil when the voltage across the primary coil is 140V .

What voltage appears across the primary coil of this transformer if 140V is applied to the secondary coil?

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What voltage appears across the primary coil of this : a step-down transformer produces a voltage of 6.9v across the secondary coil when the voltage across the primary coil

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