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I am getting the last one wrong and I don't know why. Help with the 3rd question please.

Мар hile studying a coil of unknown inductance, you connect it in series with an ideal 25.0 V battery and a 1.50 x 102 Q resi

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Answer #1

C)

Voltage, V = 30 - 25 = 5 V

5/R = 30/(R + 150)

5R + 750 = 30 R

750 = 25 R

Resistance, R = 750/25 = 30 ohm

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