PASCO ES-9080A - Procedure 3 B: Measuring C, V and Q for a Parallel Plate Capacitor

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Model No. ES-9080 Basic Electrostatics System
23
Procedure 3B: Measuring C, V and Q for a Parallel Plate
Capacitor
M9$%'24'/#$%/>%-9$%$5'$46+$,-#%(6#-$0%6,%-96#%')4-%6#%-/%F2)(6-)-6=$(C%
#-20C%-9$%4$()-6/,#96'%3$-:$$,%@D%dD%%),0%l%>/4%-9$%')4)(($(%'()-$%
*)')*6-/47%d)(2$#%4$)0%3C%-9$%$($*-4/+$-$4%)4$%-/%3$%2#$0%)#%4$()-6=$D%
*/+')4)-6=$%+$)#24$+$,-#7%M9$%$($*-4/+$-$4%*),%3$%*/,,$*-$0%-/%)%
*/+'2-$4%),0%2#$0%:6-9%)%ScienceWorkshop
£
%6,-$4>)*$%-/%/3-)6,%)%
E4)'96*)(%06#'()C%/>%6,>/4+)-6/,7%
3B.1: V Measured, Q Variable, C Constant
1. X6E24$%`7e%3$(/:%#9/:#%-9$%$F26'+$,-%#$-%2'7%M9$%?)4)(($(%?()-$%
*)')*6-/4%6#%*/,,$*-$0%-/%-9$%$($*-4/+$-$47%M9$%$($*-4/+$-$4%6#%
E4/2,0$0%-/%$)4-97%A,$%/>%-9$%#'9$4$#%6#%*/,,$*-$0%-/%-9$%=/(-)E$%
#/24*$D%#$-%)-%eJJJ%dB@7%M)Z$%*)4$%-/%'()*$%-9$%*)')*6-/4%#2>>6*6$,-(C%
>)4%):)C%>4/+%-9$%#'9$4$%),0%-9$%=/(-)E$%#/24*$D%-/%'4$=$,-%6-%>4/+%
3$6,E%*9)4E$0%3C%6,02*-6/,7
2. ?4$##%-9$%ZERO%32--/,%-/%4$+/=$%),C%4$#602)(%*9)4E$%>4/+%-9$%
$($*-4/+$-$4%),0%-9$%'()-$#%/>%-9$%*)')*6-/47
3. 8$-%-9$%'()-$%#$')4)-6/,%-/%)3/2-%e%++7%"#$%)%'4//>%'(),$%-/%-4),#>$4%
*9)4E$%>4/+%-9$%*9)4E$0%#'9$4$%-/%-9$%*)')*6-/4%'()-$#7%M9$%*9)4E$%
6#%-4),#>$44$0%+$4$(C%3C%-/2*96,E%-9$%'4//>%'(),$%-/%-9$%#'9$4$%),0%
-9$,%-/%/,$%*)')*6-/4%'()-$7%W>%C/2%)(:)C#%-/2*9%-9$%#'9$4$%),0%-9$%
*)')*6-/4%'()-$%)-%-9$%#)+$%'()*$D%$F2)(%)+/2,-#%/>%*9)4E$%:6((%3$%
-4),#>$44$0%$)*9%-6+$7
l2$#-6/,O%b9C%6#%6-%#2>>6*6$,-%-/%-/2*9%/,(C%/,$%'()-$%/>%-9$%
*)')*6-/4m
CE
VV
E
–
V
HHHHHHHHHHHHHHHHHHHHHH
C=
;
power
basic variable
capacitor
2000
VDC
proof
plane
Figure 3.2: Demonstration Setup
sphere
to earth
ground
electrometer