# THE RELATIONSHIP OF ELECTRIC FIELD INTENSITY

**Topics:**Electric charge, Electromagnetism, Electric field

**Pages:**5 (477 words)

**Published:**December 6, 2014

THE RELATIONSHIP OF ELECTRIC FIELD INTENSITY AND ITS DISTANCE FROM THE CHARGED OPOINT PHYS-232

JIANSONG HE

GROUP:

Abstract

This experiment was performed to find the electric field strength from different distance to the charged point. The field strength was determined statically, by measuring its electrical potential when subjected to loading, and dynamically, by measuring the electrical potential at different location on the conductive paper. The electrical potential was measured from three different points for each positive charge and negative one. Introduction

The objective of this research performed is to explore the relationship between electrical field strength and the distance from the charge. This research should fulfill Gauss’s law, which also known as Gauss's flux theorem, is a law relating the distribution of electric charge to the resulting electric field. The law was formulated by Carl Friedrich Gauss in 1835, but was not published until 1867. It is one of the four Maxwell's equations which form the basis of classical electrodynamics, the other three being Gauss's law for magnetism, Faraday's law of induction, and Ampère's law with Maxwell's correction. Gauss's law can be used to derive Coulomb's law, and vice versa. This experiment also designed to determine if the electric field and the distance from point to the charge has negative correlation (means the electric field strength is decreasing as the distance is increasing). In this experiment, the voltage of the point (the electrical potential) has been measured and we chose three different points to be measured. We also recorded the coordinates of charges’ and points’, which were used to calculate the distance from the point to the charges.

Materials and Methods

PK-9025 conductive paper

Conductive ink pen

Electrostatics voltage source

Silver tacs

Multimeter

The conductive paper was supported to expand the voltage among the paper’s area. The conductive ink pen was used to make the silver tacs conductive. Silver tacs and cables can support the connection between the voltage source and the conductive paper. Voltage source was used to support the voltage for the charge which is the silver tacs’ position. Multymeter was used to measure the electrical potential of the points.

RESULTS

Electrical potential recorded from three different points:

P1

(14,10)

V1

11.9 v

Q1

(12,10)

P2

(16.6)

V2

12,7 v

P3

(12,18)

V3

10,9 v

P1’

(14,10)

V1’

-10,7v

Q2

(16,10)

P2’

(16,6)

V2’

-10,2v

P3’

(12,18)

V3’

-11.8v

Q1 and Q2 and charges, which Q1 is red (positive) charge and Q2 is black (negative) charge. P1, p2, p3, p1’, p2’, p3’ are the points that the electrical potential measured and v is the voltage. Electrical potential recorded from a point to a line charge and a point charge: p

(12,14)

P1

P2

L

(12,10)(16,10)

-12.1v

Q

(15,14)

17.4

P is the position that electrical potential was measured, L is the line, Q is the point charge, P1 is the electrical potential At P of L, P2 is the electrical potential at p of Q.

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