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## Homework Statement

The giant axon of a squid is 0.5 mm in diameter, 10 cmlong, and not myelinated. Unmyelinated cell membranes behave as capacitors with 1 microF capacitance per square centimeter of membrane area.

When the axon is charged to the -70 mV resting potential, what is the energy stored in this capacitance?

## Homework Equations

R = (density* length)/Area

## The Attempt at a Solution

I know how to get R and C is given. and V is also given.

but how do i solve for E?