Essay on Magnetism Lab 19

Pickups convert the mechanical energy of the vibrating strings into electrical energy through electromagnetic induction. The permanent magnet of the pickup creates a steady magnetic field that changes as the strings vibrate. The coil wrapped within the magnetic field is induced with a current and voltage as said magnetic field alternates due to the vibrating strings. The output is an alternating current since the voltage alternates between positive and energy as the

The alternating current induces a shifting magnetic field, which creates different temporary poles at timed intervals. Due to the positioning of the semiconducting magnets and creation of the different electromagnetic forces, the like pole tend to push while the unlike poles attract, therefore, causing motion in the direction dictated by the alternating current (Funk and Getsla, 2006).

The purpose of this lab experiment was to study the magnetic field that surrounds a magnet and to see how the strength of the magnetic field change with distance from a magnet. The experiment was successful in achieving its purpose and in proving the theory of the experiments. In the experiment that we needed to show the magnetic field surrounding a magnet, we used a piece of paper, a magnet, and a compass to show the magnetic field. To view the magnetic field that is surrounding the magnet, we placed the magnet in the middle of the paper and placed the compass in the north pole of the magnet to see where the arrow is pointing, marked that point, and then placing the compass at the point again to see where it would point. We continued this

For this lab, we used a commercial solenoid with 120 turns that is 46 cm long. We set up the solenoid in a circuit with a battery, ammeter, and variable resistor. The solenoid has a compass in the middle, so that we can measure the variation in the angle. When we close the circuit, we can change the current by adjusting the variable resistor and recording the value from the ammeter. To get our results, we record the current in amps, and the deflection of the compass needle from North in degrees. We recorded this for four current values, including zero Amps.

Magnetism is the physics phenomenon produced by the movement of an electric charge causing in an attraction and repulsion force between an object. A magnetic field can be created by an electronic solenoid and can be influenced by multiple variables. The number of coils on a solenoid will affect the strength of the magnetic field. Furthermore, the length of the solenoid will determine the strength of the magnetic field. As more current is passed through a solenoid the magnetic field will greaten. Current and voltage are propionate and as voltage increases, so will the current. Many variables may affect the strength of a solenoid, some of which are the number of turns wrapped and length of the rod.

If a magnetic bar is held at the middle by a string, it will act as a compass due to the poles being attracted to the Earth’s magnetic field and point northward with its north-seeking pole and southward with its south-seeking pole, or north and south poles respectively. All magnets have at least one north and south pole and some may have more than one of each. When the north pole of a magnet is brought near another north pole, the magnets

1.3 After assembling the circuit we switched the power on. We then joined the Digital Volt Meter (DVM) so that it will measure the input voltage Vi and adjust the input to about 0.5V. Using a second DVM as shown in figure 3 we could measure the output voltage V0. We repeated the procedure to find the maximum negative output voltage and the minimum input voltage needed to achieve this.

“The magnetic field force produced by a current-carrying wire can be greatly increased by shaping the wire into a coil instead of a straight line. If wound in a coil shape,

Equation 1 below shows the relationship of force (F), current (i), length (L), magnetic field (B), and angle (Ɵ) for a current carrying wire. In this experiment, the angle between the wire and the magnets is 90⁰. This means that sinƟ=1 and can be eliminated.

Electrons circling an atom set up small magnetic fields. In most materials, these fields are aligned in a fairly random manner, so that all of these small fields cancel each other. In a magnet, however, these fields line up to create a net magnetic dipole, so that the object sets up a magnetic field in the surrounding space.

From analyzing the above diagram it can be seen that the above statements can be perceived in a far clearer manor as the effect of the induced emf can be understood far more easily.

“AN ALTERNATING CURRENT IS THEN PRODUCED, FROM THE LARGE POWER SOURCE, AND PASSES THROUGH THE GUIDEWAY, CREATING AN ELECTROMAGNETIC FIELD WHICH TRAVELS DOWN THE RAILS”. AS DEFINED BY THE ENCARTA ONLINE DICTIONARY, AN ALTERNATING CURRENT IS “A CURRENT THAT REVERSES DIRECTION.” THE STRENGTH OF THIS CURRENT CAN BE MADE MUCH GREATER THAN THE NORMAL STRENGTH OF A MAGNET BY INCREASING THE NUMBER OF WINDS IN THE COILS. THE CURRENT IN THE GUIDEWAY MUST BE ALTERNATING SO THE POLARITY IN THE MAGNETIZED COILS CAN CHANGE. THE ALTERNATING CURRENT ALLOWS A PULL FROM THE MAGNETIC FIELD IN FRONT OF THE TRAIN, AND A PUSH FROM THE MAGNETIC FIELD BEHIND THE TRAIN. THIS PUSH AND PULL MOTION WORK TOGETHER ALLOWING THE TRAIN TO REACH MAXIMUM VELOCITIES WELL OVER 300 MILES PER HOUR.

Aim: The aim of the experiment is to investigate what affects the strength of an electromagnet.

Rizzoni (2004) asserts that when electrical energy is supplied to the windings perpendicular to the direction of the magnetic field, the flowing current and the magnetic field will interact. As a result, mechanical energy will be produced by the magnetic field, leading to motion. Fleming’s Left Hand Rule can be used to determine the direction of the motion

On the other hand, in the case of barber pole biasing, instead of changing the magnetization direction, the local current is directed away from the ease axis direction by patterned conducting strips deposited directly atop the sensing layer [Fig. (-- removed HTML --) 1(b) (-- removed HTML --) ]. The strips are aligned at an angle of 45° from the ease axis direction of the sensing element. In this way, when a current is supplied from the two end contacts, electrical current between the neighboring strips will form a 45° angle from the magnetization direction and thereby leading to a linear response to transverse field. It is clear from the design that the barber pole design requires additional process steps and non-uniformity also exists at the edges. (-- removed HTML --)