The gap in the circuit seen in Fig. P7.87 will arc over whenever the voltage across the gap reaches 45 k V. The initial current in the inductor is zero. The value of B is adjusted so the Thévenin resistance with respect to the terminals of the inductor is -5 k2. a) What is the value of B? b) How many microseconds after the switch has been closed wll the gap arc over? Figure P7.87 5 kN 20 kn3 Bi, 200 mH Gap 40 V [al

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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.