# lab survey Magnetic field

PHYSICS FOR SCIENTIST AND TECHNICAL ENGINEERS LABORATORY EXPERIMENTS

EXPERIMENT your five

(Assignment)

EXPERIMENT 5 – PERMANENT MAGNET FIELDS

OBJECTIVES

1 . To study the operation of magnetic fields.

installment payments on your To determine the North and South poles of magnets and magnetic discipline lines. several. To understand the attractive and repulsive pushes acting on this.

INTRODUCTION

Electric powered current is defined as the rate from which charge flows through a surface area. As with all quantities thought as a rate, you will discover two ways to write down the definition of electric current. I =�

Δq

Δt

and instantaneous current for those with not any fear of calculus I =�

lim

Δq

=�

dq

Δt → 0

Δt

dt

The unit of current is definitely the ampere�[A], which is called for the French scientist André Marie Ampère(1775-1836). Since charge is usually measured in coulombs and time is usually measured in seconds, an ampère is the same as a coulomb per second. ⎡

A =�

C

s

This is an algebraic relation, not just a definition. The ampere is known as a fundamental product in the International System. Additional units will be derived from this. Fundamental models are themselves defined simply by experiment. In the matter of the ampere, the experiment is electromagnetic in characteristics.

A magnet is a material or object that produces a magnetic field. This kind of magnetic field is invisible but is in charge of the most notable real estate of a magnet: a power that brings on other ferromagnetic materials, such as iron, and draws in or repels other magnets.

Here, we will talk about more about electromagnets. An electromagnet is made from a coil of wire that acts as a magnet when a current passes through it although stops like a magnet if the current ceases. Often , the coil is wrapped around a core of " soft" ferromagnetic material including steel, which in turn greatly improves the magnetic discipline produced by the coil.

In regards to typical club magnet -- or any magnetized object (like the Earth, to get example) - there are lines of permanent magnet flux. They are said to circulation away from the north pole and re-enter at the south rod. �

These types of field lines become evident if straightener filings are sprinkled more than a sheet of paper beneath which there is also a bar magnet. Their direction can be drawn using a little 'plotting compass'. The needle aligns while using N-S field (flux) lines and the needle follows a similar pattern as revealed by iron filings. �

[Iron filings that contain oriented in the

permanent magnetic field produced by a club magnet]

When two magnets happen to be brought near each other, the flux lines from the two magnets have interaction. If these flux lines are going in the same direction, they are going to link up and the magnets will attract the other person. If they are going in opposing directions, they may produce a repulsive force and push faraway from each other (often taking the magnets with them). The pressure between them depends on the separation range and the debordement density (magnetic strength) from the magnets applied. A magnetic field is a numerical description with the magnetic affect of electric currents and magnetic elements. The magnet field any kind of time given point is particular by equally a direction and a magnitude (or strength); as such it can be a vector field.

Mapping the magnetic field of an thing is simple in principle. Initial, measure the strength and direction of the permanent magnetic field by a large number of locations (or at every point in space). Then, mark each site with a great arrow (called a vector), directed in the direction of the area magnetic discipline with its magnitude proportional towards the strength from the magnetic discipline.

An alternative approach to map the magnetic discipline is to 'connect' the arrows to form magnetic field lines. The direction of the magnetic discipline at any point is parallel to the direction of nearby discipline lines, as well as the local thickness of field lines could be made proportionate to its strength.

Permanent magnet field lines are like the contour lines (constant altitude) on a topographic map in that they represent anything...

References:.

1 ) Lam Chok Sang, Lim Siang Kee. " Pre-U Text STPM Physics”, Pearson Malaysia Sdn. Bhd G. J

installment payments on your David Halliday, Robert Resnick, Jearl Walker. " Basics of Physics(6th edition)”. Ruben Wiley & Sons, Inc. (JWa, JWb).

3. Hugh D. Small, Roger A. Freedman, Lewis Ford. " University Physics(12th edition)”, Pearson Education publishings.

19.08.2019

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