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31. For the following LR circuit, emf-25V, R 5Ω, and L-SH. At a certain time a current of 4A is going through the resistor. a. What is the potential difference across the inductor at this time? b. Draw the positive and negative sides of the inductor at this time. c. Which direction is the induced current flowing through the inductor at this time? d. Is the current through the resister increasing or decreasing at this time?

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