Question

Please answer both portions

2: A V-8.V source is connected in series with an R-1.7-kΩ resistor and an L-28-H inductor and the current owed to maximum. At time0 a switch is thrown that disconnects the voltage source, but leaves the resistor and the inductor connected in their own circuit. After the current decreases to si % of its maximum value, the battery is reconnected into the circuit by reversing the switch. - ム50% Part (a) At what value of the time t, in milliseconds, does the current reach 75 % of its maximum? Potential 100% 0 cotan0 asin0 sin0 tan Attempts remaining: 4 5 6 atan0 acotan0sinh0 detailed view 12 3 0 O Degrees Hints: ③ for a 0%-do luction. Hints remaining:- Feedback: 0% deduction per feedback. .You need to add the time for the current to decay from maximum to SI % and the time needed for the current to then increase back to 75 %. For the first step use the e circuit as a function of time, in terms of the initial current, the for the decaying current in an RL and the in and solve for the elapsed time. For the second step use the expression for the growing current (starting from zero current) in an RL circuit as a function of time, in terms of the maximum current, the resistance, and the inductance. Solve for the time to charge from zero current to 75 % of maximum and for the time to charge from zero to 51 % and subtract the shorter time from the longer. Part (b) How much energy, in millijoules, is supplied in total by the battery, both in initially bringing the current to maximum and in bringing the current back to the 75 % level from 51 %? Ignore energy dissipated in the resistor during those processes.

Answer 1

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