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## Homework Statement:

- You have two coils (eg. in a transformer). The primary coil is connected to a voltage source and the second coil is an open circuit? What is the voltage across the terminals of coil 2?

## Relevant Equations:

- v = L di/dt

Hi, so my question is basically:

I would think that the answer is yes, as the Mutual inductance depends on the current passing through coil 1? However, the answer scheme seems to ignore the [itex] M_{12} \frac{di_{1}}{dt} [/itex] term and just think about the step-up/down aspect of the voltage.

I would appreciate any help in understanding why this is the case.

I apologise for not providing numbers or anything, but I am just interested in the concept here, rather than any numbers.

Thanks in advance.

**Does the mutual inductance from coil 1 show up in the voltage of coil 2 even if coil 2 is an open circuit?**I would think that the answer is yes, as the Mutual inductance depends on the current passing through coil 1? However, the answer scheme seems to ignore the [itex] M_{12} \frac{di_{1}}{dt} [/itex] term and just think about the step-up/down aspect of the voltage.

I would appreciate any help in understanding why this is the case.

I apologise for not providing numbers or anything, but I am just interested in the concept here, rather than any numbers.

Thanks in advance.