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Electrical charge on Capacitor

  • Thread starter patep023
  • Start date
  • #1
14
0

Homework Statement



A dc current of 3 A flows through an initially discharged capacitor.
After 2 micro s what is the electrical charge on the capacitor?

Homework Equations


q(t)= integral i(t) dt between t=0 and t


The Attempt at a Solution


(3t^2)/2=6x10^-12 C. Is this right?
 

Answers and Replies

  • #2
gneill
Mentor
20,779
2,759

Homework Statement



A dc current of 3 A flows through an initially discharged capacitor.
After 2 micro s what is the electrical charge on the capacitor?

Homework Equations


q(t)= integral i(t) dt between t=0 and t


The Attempt at a Solution


(3t^2)/2=6x10^-12 C. Is this right?
Your relevant equation is okay, but it looks like you set up the integral incorrectly. What function did you integrate?
 
  • #3
14
0
f(q)=i ?so integral of 3A which is (3t^2)/2 ?
 
  • #4
gneill
Mentor
20,779
2,759
f(q)=i ?so integral of 3A which is (3t^2)/2 ?
Nope. Your function is a constant. Dropping units for now, I(t) = 3. There's no "t" in the function to become a ##t^2## upon integrating.
 
  • #5
14
0
ye I was just being stupid, ty for the help
 

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