How Do You Calculate E in Mica for a Capacitor?

  • Thread starter Thread starter mr_coffee
  • Start date Start date
Click For Summary
SUMMARY

The discussion focuses on calculating the electric field (E) in a mica dielectric for a parallel-plate capacitor with a capacitance of 60 pF and a plate area of 130 cm². The dielectric constant (k) for mica is specified as 5.4. The initial calculation for E using the formula E = [Q/A]/(k*Eo) yielded an incorrect result of 1.609 V/m. The correct approach involves accurately determining the charge (Q) using the relationship Q = C * V, where C is the capacitance and V is the voltage across the capacitor.

PREREQUISITES
  • Understanding of parallel-plate capacitor theory
  • Familiarity with dielectric materials and their properties
  • Knowledge of capacitance calculations
  • Basic principles of electric fields and charge distribution
NEXT STEPS
  • Review the formula for calculating electric fields in dielectrics
  • Learn about the properties of mica as a dielectric material
  • Explore advanced capacitor design and optimization techniques
  • Investigate the effects of varying voltage on capacitance and electric field strength
USEFUL FOR

Electrical engineers, physics students, and anyone involved in capacitor design and analysis will benefit from this discussion.

mr_coffee
Messages
1,613
Reaction score
1
A parallel-plate capacitor has a capacitance of 60 pF, a plate area of 130 cm2, and a mica dielectric ( = 5.4). At 60 V potential difference, calculate the following values.

(a) E in the mica
wrong check mark V/m

(b) the magnitude of the free charge on the plates
C
(c) the magnitude of the induced surface charge on the mica
C

I tried the following:
E = [Q/A]/(k*Eo);
E = (1e-12/.013)/(5.4)(8.85e-12);
E = 1.609 which is wrong.

I got Q by the following: C = QV; Q = C/V; 60e-12/60 = 1e-12
 
Physics news on Phys.org
Sorry for the late reply. If you're still working on this then check out the websites I gave you in this thread and see if you don't have better luck.
 

Similar threads

  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
4K
Replies
1
Views
3K
  • · Replies 18 ·
Replies
18
Views
4K
Replies
3
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
Replies
14
Views
3K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 2 ·
Replies
2
Views
4K