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A coil has an inductance of $0.15 \mathrm{H}$ and a resistance of $33 \Omega$. The coil is connected to a $6.0$ -V ideal battery. When the current reaches half its ...

Question

A coil has an inductance of $0.15 \mathrm{H}$ and a resistance of $33 \Omega$. The coil is connected to a $6.0$ -V ideal battery. When the current reaches half its maximum value: (a) At what rate is magnetic energy being stored in the inductor? (b) At what rate is energy being dissipated? (c) What is the total power that the battery supplies?

A coil has an inductance of $0.15 \mathrm{H}$ and a resistance of $33 \Omega$. The coil is connected to a $6.0$ -V ideal battery. When the current reaches half its maximum value: (a) At what rate is magnetic energy being stored in the inductor? (b) At what rate is energy being dissipated? (c) What is the total power that the battery supplies?



Answers

An inductor used in a dc power supply has an inductance of 12.0 H and a resistance of 180 $\Omega$. It carries a current of 0.500 A. (a) What is the energy stored in the magnetic field? (b) At what rate is thermal energy developed in the inductor? (c) Does your answer to part (b) mean that the magnetic-field energy is decreasing with time? Explain.


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