Electric potential along the x-axis

  • #1

Homework Statement


The electric potential along the x-axis is V=100e^(−2x/m), where x is in meters.
Find Ex at x=1.0m and Ex at x=2.1m


Homework Equations


V=Ed
Ex = dV/dx (?)



The Attempt at a Solution


I took the derivative of V and got (-200/m)e^(-2x/m)
I don't know what m is and I'm just not sure how I can get an integer value for Ex at x=1.0m and 2.1m
EDIT===
I assumed m=1 and got the correct answer, don't understand what m is though
 

Answers and Replies

  • #2
TSny
Homework Helper
Gold Member
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m might just represent units of meter. So the 2 in the exponential has units of 1/m and they decided to show that explicitly.
 

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