An RC circuit has a 55.0 mu F capacitor connected to a 780 ohm resistor. a). When the capacitor is charged, how long does it take for the capacitor to reach 80% of full capacity

0.069 s

Explanation:

The proportion of the full charge of a capacitor at any time, t, is given by

where τ is the time constant given by the product of the resistance and capacitance. Hence,

At 80%,

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c) up is the direction the magnetic force is acting on the charge.