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Capacitor Lab
Class XII · Electrostatics: C = Kε₀A/d, with battery vs isolated comparison.
C
44.270 pF
V
9.000 V
Q
398.430 pC
U
1.793 nJ
E inside
4.50e+3 V/m
u
8.96e-5 J/m³
A
100.00 cm²
Mode
Battery on
Controls
Plate area A (m²)
Separation d (mm)
Dielectric K
Battery V (V)
Formulas
- C = K ε₀ A / d
- Q = CV
- U = ½CV² = Q²/(2C)
- u = ½ε₀K E², E = V/d
Try this
Battery mode: increase d. V stays fixed, Q drops, U drops. Switch to Isolated and pull the plates apart: Q is locked, so V rises and U increases (you did the work!). Add a K = 5 dielectric and watch the difference between the two modes.