What must be the potential difference across the plates of the capacitor filled with a dielectric so that it stores the same amount of electrical energy as the empty capacitor?

Explanation:

The electrical energy stored in the empty capacitor is defined as:

Where is the potential difference across the plates of the capacitor and is its capacitance.

The capacitance of the capacitor with a dielectric is given by:

The electrical energy stored in the capacitor filled with a dielectric is:

We have . Thus:

Replacing (1) and solving for :

answer; the correct answer is technician a; ///100%good luck

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27