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In Fig. $30\mathrm{.}11$ in the textbook, suppose that $E=69\mathrm{.}0V,R=210$ and $L=0\mathrm{.}160H.$ With switch $S_2$ open, switch $S_1$ is left closed until a constant current is established. Then $S_2$ is closed and $S_1$ opened, taking the battery out of the circuit.

What is the initial current in the resistor, just after $S_2$ is closed and $S_1$ is opened?

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Part B

What is the current in the resistor at $t=4\mathrm{.}30{10}^{-4}s?$

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Part C

What is the potential difference between points b and c at $t=4\mathrm{.}30{10}^{-4}s?$

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