1.Introduction

Hi there, We are ElectroField, and we are doing the study of Magnetic Field in a solenoid.

A magnetic field is the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field.Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.In special relativity, electric and magnetic fields are two interrelated aspects of a single object, called the electromagnetic tensor; the split of this tensor into electric and magnetic fields depends on the relative velocity of the observer and charge.In everyday life, magnetic fields are most often encountered as a force created by permanent magnets, which pull on ferromagnetic materials such as iron, cobalt, or nickel and attract or repel other magnets. Magnetic fields are widely used throughout modern technology, particularly in electrical engineering and electromechanics. The Earth produces its own magnetic field, which is important in navigation, and it guards Earth's atmosphere from solar wind. Rotating magnetic fields are used in both electric motors and generators. Magnetic forces give information about the charge carriers in a material through the Hall effect. The interaction of magnetic fields in electric devices such as transformers is studied in the discipline of magnetic circuits.(Wikipedia,2015a)

A volt is defined as the difference in electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points.It is also equal to the potential difference between two parallel, infinite planes spaced 1 meter apart that create an electric field of 1 newton per coulomb. Additionally, it is the potential difference between two points that will impart one joule of energy per coulomb of charge that passes through it.(Wikipedia,2015b)

Magnetic Field is important in our planet as it enables us to have all these technology for mostly medical. However, without magnetic field, we would not be alive. The magnetic field protects us from a number of things, including space rocks and charged particles of solar winds. So, without the magnetic field we could be vulnerable to the sun’s emissions other celestial events. Some scientists have said that the solar winds could puncture holes into the ozone layer, increasing the amount of cosmic radiation on Earth. This could prove dangerous for our health. Plus, a depleting atmosphere could cause extreme weather events and climate changes.In other words, losing the magnetic field could be very bad (Daily Deal Bar, 2015). Hence, we are investigating magnetic field in a solenoid with different voltages to figure out how does the voltage change the magnetic field. To find the answer, we have to do the experiment. We will pass electricity through the solenoid which will convert electricity to magnetic field. We will measure magnetic field using data logger with magnetic field sensor at different distance. From this, we think that the more voltage in the solenoid, the more magnetic field it produces and the middle of the solenoid has the most magnetic field. By doing this experiment, we will understand that it is beneficial to us as in medical, we need magnetic field to scan our human body for any diseases and we need magnetic field for security to scan for metal. One example is NMR.

Hence, using these information, we will understand the concept of magnetic field to be used in the experiment.



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