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A 10Ω resistor and a 5 Ω are connected in parallel. This pair is then connected in series in with another 4 Ω resistor. What is the equivalent resistance of the circuit?

2 point charges one of 1.0µC and one of 10µC repel with a force of 1.0 µN. What is distance between the charges? (k= 1/4πε0 = 9.0 × 109 N · m2/C2)

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