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A simply RC circuit made up of a capacitor with capacitance C and resistor with resistance...

A simply RC circuit made up of a capacitor with capacitance C and resistor with resistance R = 15 kΩ is attached to a battery with emf E = 24 V. If time constant is 25 µs, what is the capacitance C and the time it takes for the voltage across the capacitor to reach 16 V after the switch is closed at t = 0?

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