# Varying Separation Distance of Capacitor Plates#

A parallel-plate capacitor is made of two square plates with side length 15.0 $$\textrm{ cm}$$ that are 1.50 $$\textrm{ mm}$$ apart. The capacitor is connected to a 60 $$\textrm{ V}$$ battery. With the battery still connected, the plates are pulled apart to a separation distance of 2.50 $$\textrm{ mm}$$.

## Part 1#

What is the energy stored in the capacitor before the plates are pulled apart?

## Part 2#

What is the energy stored in the capacitor after the plates are pulled apart?

## Part 3#

Which best describes why the energy decreases even though work is done separating the plates?

• It is lost to the surroundings in the laboratory

• Charge is transferred to the battery

• It is transferred into heat energy