7.26 In the circuit shown in Fig. P7.26, both switches operate together; that is, they either open or close at the same time. The switches are closed a long time before opening at t = 0. a) How many microjoules of energy have been dissipated in the 12 kN resistor 12 ms after the switches open? b) How long does it take to dissipate 75% of the initially stored energy? Figure P7.26 t = 0 1.8 kN t = 0 10 120 V 12 k2 68 kN 3 HF

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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.