# Magnetic field around a conductor

Fredrik Hansen IB1A

Physics Department

Fredrik Hansen

Mail: [email protected]

Laboratory experiment:

Magnetic Field around a Conductor

IB Physics Higher Level

laboratory experiment report

by Fredrik Hansen

class: IB1A

supervisor: Anna Malmberg

conducted: 2009-05-29

written: 2009-07-27

Contents

## Introduction

A conductor induces a magnetic field around itself while carrying a current. This magnetic field has the same properties as normal magnetic field in all aspects except that the field is oriented in a closed circle around the conductor following the right hand rule.

## Symbols

In this experiment following symbols are used:

B = magnetic field [T]

I = current [A]

V = voltage [V]

R = resistance [Ω]

µ0 = permeability of free space (constant) [4π*10-7 TmA-1]

## Aim

The scientist is supposed to investigate the relationship between current and magnetic field in a conductor by running a varying current through a circuit and measure the magnetic field induced by it. Furthermore the practical skills in the subject of the magnetism and electrical currents should improve.

## Research question

How is the magnetic field (B) dependant on the current (I)?

### Controlled variables:

• Permeability of free space (µ0)

## Hypothesis

The magnetic field due to a straight conducting wire follows the relationship and using this as a linear function with B as the y value and I as the x value the gradient will be µ0/2πr. Then the gradient can simply multiplied by 2πr to find µ0. The relationship should be linear as all parts of the gradient are constants.

● magnetometer

● conductor

● power supply

● voltmeter

● ampere meter

## Preparation

Before the experiment is conducted the scientist must set up the equipment like in the picture. The conductor that is going to be investigated ...