Question:

A capacitor consists of two 7.0-cm-diameter circular plates separated by 1.0 mm. The plates are charged to 160 V, then the battery is removed. 1)How much energy is stored in the capacitor? 2)How much

A capacitor consists of two 7.0-cm-diameter circular plates separated by 1.0 mm. The
plates are charged to 160 V, then the battery is removed.
1)How much energy is stored in the capacitor?
2)How much work must be done to pull the plates apart to where the distance
between them is 2.0 mm?

A capacitor consists of two 7.0-cm-diameter circular plates separated by 1.0 mm. The plates are charged to 160 V, then the battery is removed. 1)How much energy is stored in the capacitor? 2)How much work must be done to pull the plates apart to where the distance between them is 2.0 mm?

Answer

& x 80 xx (35X103)² x (160)2
S01
-0.0
(103)
2 -G
Reo (358 x 10 x (16 x 16) X 102
(103)
diametere tam
radius: 35mm = 35x153m
E
1.92 x 107x10 + E0 x 103
E = 49.280 J xos
Capacitence =
bod
d
- to an
d
4
4.92 x 10
it is connected to battery of gov
Hone
energy stored = 3082
2) capacitor is not connected
to battery it means (9) charge
is constormt
Henin
qwnst
Pr = rok?
82
P- electrostatic
pressure
280
F=PA =
S? A
26
92
260A
Ft 8(d)
F Const
work done
F. displacement
- 92
xd
2E0A
d= Imm
Est al v2
d
I da
desplacoment
(:q= cv
EocA
-
240 A 12
Eo A v2 d
✓
(1)
212
-
eo A r2 x (160) ² (103)
2 (10-3)2
60 x 3:14x (35) ²x20 x 86-3²x103
3 x lot
4.92 ao x 101
w z 0.5 to

& x 80 xx (35X103)² x (160)2 S01 -0.0 (103) 2 -G Reo (358 x 10 x (16 x 16) X 102 (103) diametere tam radius: 35mm = 35x153m E 1.92 x 107x10 + E0 x 103 E = 49.280 J xos Capacitence = bod d - to an d 4 4.92 x 10 it is connected to battery of gov Hone energy stored = 3082 2) capacitor is not connected to battery it means (9) charge is constormt Henin qwnst Pr = rok? 82 P- electrostatic pressure 280 F=PA = S? A 26 92 260A Ft 8(d) F Const work done F. displacement - 92 xd 2E0A d= Imm Est al v2 d I da desplacoment (:q= cv EocA - 240 A 12 Eo A v2 d ✓ (1) 212 - eo A r2 x (160) ² (103) 2 (10-3)2 60 x 3:14x (35) ²x20 x 86-3²x103 3 x lot 4.92 ao x 101 w z 0.5 to

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