Gauss' Law: Infinite plane with charge

[SnakeDoc]

Homework Statement

An infinite plane of charge has surface charge density 6.8 µC/m2. How far apart are the equipotential surfaces whose potentials differ by 100 V? In mm

Homework Equations

E=σ/(2ε₀)

The Attempt at a Solution

So first I solved for E= 6.8e-6/(2*8.85e-12) = 384170.791

then because ΔV= E *ΔX
so
ΔX=ΔV/E

so then I substituted
ΔX = 100/ 384170.791
ΔX = .0002603

The site says that I've made a power of ten error the answer must be in mm but I'm not sure what I am doing wrong

 

[gneill]

ΔX = 100/ 384170.791
ΔX = .0002603

The site says that I've made a power of ten error the answer must be in mm but I'm not sure what I am doing wrong

So far you've expressed your ΔX in meters. What value did you enter for your answer in mm? How many significant figures did you provide?

 

[SnakeDoc]

I entered 2.603 mm

 

[gneill]

I entered 2.603 mm

Numerically the result looks to be good. How many significant figures do the given data support?

 

[SnakeDoc]

I realized my mistake its supposed to be .2603mm I converted from Meters to millimeters improperly. Thank you.