# Using Gauss' Law To Find Capacitance

**Steps to calculating capacitance**

**1. Imagine the capacitors are charged to +Q and -Q**

**2. Use Gauss' Law to find the electric field between them**

**3. **

**4. **

So we know from the derrivation in the previous post that the electric field between two parallel plates with +Q and -Q (or and ) is:

Because we did the derrivation for the this in the previous post we can skip steps 1 and part of step 2.

**Step 2.5:**

**Step 3: **

(since l is just the distance d between the plates)

**Step 4:**

(from step 2.5)

(from step 3)

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