3 years ago

Which best explains why a wood-burning fireplace represents an open system?

Physics

1 answer:

Alona [7]3 years ago

5 0

The answer will be B

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The induced emf in the coil is 0.522 volts.

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$\epsilon=\dfrac{-d\phi}{dt}\\\\\epsilon=\dfrac{-d(BA)}{dt}\\\\\epsilon=B\dfrac{-d(\pi r^2)}{dt}\\\\\epsilon=2\pi rB\dfrac{dr}{dt}\\\\\epsilon=2\pi \times 9.65\times 10^{-2}\times 1.14\times 0.756\\\\\epsilon=0.522\ V$

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