Explanation: The formula Q = CE defines the fundamental relationship between charge, capacitance, and voltage in a capacitor. Here, 'Q' represents the **quantity of electrical charge** stored in the capacitor, measured in Coulombs. 'C' is the capacitance in Farads, and 'E' is the applied voltage in Volts. Therefore, Q = CE directly **determines the quantity of charge present in a capacitor** when a specific voltage is applied across it. Option B is incorrect because "the Q of a circuit" refers to the **Quality Factor** (a different 'Q'), which is a measure of a circuit's selectivity or resonance sharpness, especially in resonant RLC circuits. This is a distinct concept from the quantity of charge stored in a capacitor.