COULOMB BALANCE 영어 실험 보고서 (쿨롱상수 측정)

목차

․ TITLE coulomb balance
․ NAME

․ ABSTRACT

․ 1. INTRODUCTION
- PHYSICS PRINCIPLE AND THEORETICAL BACKGROUND
- Coulomb\'s law
- Definition of a Coulomb
- Analogy between electric and gravitational forces
- Electric Potential Energy
- Purpose of experiment

․ 2. EXPERIMENTAL SET UP AND METHOD
[Apparatus]
- Torsion Balance Setup
- Slide Assembly Setup
․ PROCEDURE AND RESULT
[procedure]
- Caution
- EXPERIMENT1
- EXPERIMENT2
- EXPERIMENT3
[result]

․ DISCUSSION

․ CONCLUSION

․ REFERENCE

본문내용

periment repeatedly .
[result]
R (cm)
Θ ( ˚)
10
155
156
average
155.5
Standard error
0.71
R (cm)
Θ ( ˚)
20
186
190
193
average
189.67
Standard error
3.51
R (cm)
Θ ( ˚)
14
178
186
187
185
average
184.00
Standard error
4.08
R (cm)
Θ ( ˚)
log Θ
log R
R²
20
189.67
2.278
1.301
400
14
184.00
2.265
1.146
196
10
155.5
2.192
1.000
100
① force versus distance
→ Analysis
2a =
3.74cm (0.0374m)
a =
0.017m (Radius of sphere)
ε0 =
8.85*10^(-12) F/m
C =
4 pi ε a = 4*PI()*8.85*(10^(-12))*0.0188
=2.09079E-12F
② force versus charge
distance
10 cm =
0.1 m
CHARGE (kV)
supended
sliding
Θ ( ˚)
sphere
sphere
6
6
155
5
172
4
175
3
180
2
184
→ Analysis
q=CV
average mg/Θ = 1.34E-05 (N/˚)
CHARGE (V)
CHARGE (C)
supended
sliding
supended
sliding
Θ ( ˚)
F (N)
k (Nm²/ C²)
sphere
sphere
sphere
sphere
6000
6000
1.254E-08
1.254E-08
155
2.08E-03
2.081E-05
6000
5000
1.254E-08
1.045E-08
172
2.31E-03
1.924E-05
6000
4000
1.254E-08
8.363E-09
175
2.35E-03
1.566E-05
6000
3000
1.254E-08
6.272E-09
182
2.44E-03
1.222E-05
F=kqq'/R^2
k=FR^2/qq'
k = 9 ×10^9 Nm²/ C²
Theory value k 9.00E+09
average
1.698E-05
Standard deviation
3.839E-06
Error
1.00
Percentage error
100
③ the coulomb constant
(0mg = 0°)
m (mg)
m (kg)
Θ ( ˚)
mg (N)
mg/Θ (N/˚)
20
0.0002
104
0.00196
1.88E-05
20
0.0002
225
0.00196
8.71E-06
50
0.0005
315
0.00490
1.56E-05
50
0.0005
373
0.00490
1.31E-05
average
1.41E-05
Standard error
4.27E-06
→ Analysis
m (mg)
m (kg)
Θ ( ˚)
mg (N)
mg/Θ (N/˚)
20
0.0002
104
0.00196
1.88E-05
20
0.0002
225
0.00196
8.71E-06
50
0.0005
315
0.00490
1.56E-05
50
0.0005
373
0.00490
1.31E-05
average
1.41E-05
Standard error
4.27E-06
kV
C
6
1.25E-08
5
1.05E-08
4
8.36E-09
3
6.27E-09
DISCUSSION
- In this experiment, We experimented motion change of sphere by change of voltage and motion change of sphere by distance change that is competed that use Coulomb's law.
Initially, We were hard because an experiment goes wrong, but I hear and take care and proceeded in an experiment assistant's explanation.
Experiment 1, I could know that motion of sphere is decrescent when distance of sphere that is competed kept away.
And experiment 2, I could know that motion of sphere grew as voltage is high.
When experiment, I take care and experimented because there is danger of voltage, and I could know that force of Coulomb's law is proportional to charge.
I seem to be known better investigating Coulomb's law.
CONCLUSION
- This subject confirmed Coulomb's law measuring force between two charge through an experiment.
Conclusively I could know force between charge is inverse proportion in square of distance between two charge, force between two charge is proportional to two charge. And electrostatic capacity C became 1/2 times becoming distances between two spheres 2 times.
I could certify Coulomb's law each experiment.
REFERENCE
- www-ph.postech.ac.kr/Edulab/ gen-phy2/coulomb/coulomb.html
- http://physics.skku.ac.kr/new/curriculum/gpl.asp
- www.sgs.co.kr/segye/technote/ read.cgi?board=menu02&y_number=11

키워드

COULOMB BALANCE,   쿨롱 상수,   실험 보고서