Final answer:
To find the capacitor voltage at any given time constant, divide the applied voltage by the time constant(option 2).
Step-by-step explanation:
The time constant can be calculated using the formula T = RC, where T is the time constant, R is the resistance, and C is the capacitance. To find the voltage on the capacitor at any given time constant, we can use the equation V = emf(1-e^(-t/RC)), where V is the capacitor voltage, emf is the applied voltage, t is the time, R is the resistance, and C is the capacitance.
Option 2: Divide the applied voltage by the time constant to calculate the capacitor voltage is the correct statement.