Welcometo

Physic course

SC 442

Honor section

For your knowledge!!!For your knowledge!!!

The presentation that you are about to

witnessed has been conducted

the 02 February 02 with the complete collaboration of

Xi Hi LiToday as the research project of the Fall 2002

we present the

Mapping of Electric FieldMapping of Electric Field

The PlanThe Plan

IntroductionSome History

The TheoryThe Objectives

Equipments Used The Procedure

More IdeaMy Conclusion

HistoryHistory

Niel Bohr (Danish)Niel Bohr (Danish)

Charles Augustin Charles Augustin de Coulomb de Coulomb (French)(French)

Michael Faraday Michael Faraday (British) (British)

TheoryTheory

.

                                                                  

The Bohr’s Atom

Coulomb's Law

• The charges of the same charge repel & the Charges of different charges attract

The Coulomb Force

221

221

***4

***

r

qq

r

qqkF

The Faraday Work

The electric field

q

FE

2*

*

rq

qkQsource

The Electric Field

2

*

r

QkE source

Constant Electric Field

fi VVq

dFE

*

sdEVV if *

Electric field as Gradient (R^3)

OBJECTIVESOBJECTIVES

• To determine the shape of equipotential surfaces and electric field lines associated to a dipole with:

a) two point charges

b) two parallel plates, and to compare each of

these to theoretical predictions

The EquipmentsThe Equipments

DC power supply

Transformer (step down)

Connecting Wires

Galvanometer

Voltmeter

Field mapping

Two Probes

Two probes & Board

The Procedure

Two Circuits

Circuit 1

Circuit 2

Electric field

CNxVE /,

Distance between probes

∆x, m

Potential difference

∆V,V

Electric FieldE=dV/dx

N/C

0.010 0.250 25.000

0.020 0.650 32.500

0.030 1.150 38.333

0.040 1.800 45.000

0.050 2.350 47.000

0.060 3.000 50.000

0.070 3.750 53.571

0.080 4.000 50.000

0.090 4.000 44.444

Are electric and magnetic fields different?

Electric fields are produced wherever there is a voltage

Electric fields can be shielded easily

Magnetic fields are produced by current - the quantity of electricity flowing.

While magnetic fields cannot

Electric Field Vs

Magnetic Field

Electric fields are measured in volts per meter (V/m)

magnetic fields in tesla (T), or amperes per meter (A/m).

General ThanksTO

Dr Roman Kezerashvil

Fellow Classmates Sc Honor section

We have been delighted We have been delighted

by your attentionby your attention

Thank youThank you