Experiment A
Introduction
The name dipole is given to a bar magnet since the magnet has two poles, that is, South and North. In case a magnet is broken into two, creation of two isolated poles never exist because the individual fragment still contain two poles. Magnetic monopoles do not exist hence the simplest magnetic field source is the dipole. Baxis, magnetic field, for an ideal dipole is given by Baxis=µ04π=2µd3
Objective
Materials
An iPhone compass
Regular compass
A ruler
Tape measure
Procedure
Set an experiment on a wooden desk away from metal components, and place a magnet on the wooden surface.
On the east-west axis, place the magnet and make it point towards the compass centre.
Plot a graph of magnetic field strength against the magnet distance on a graph paper, and measure data for more than 5 distances
Using the magnetic field due to a dipole expression, plot the magnetic field against 1r3 and calculate the dipole moment
Compare the results with the results from literature, and to the results from a current carrying coil.
Experiment B
Introduction
The magnetic field and the wire carrying the current always circle in ether clockwise or counter clockwise direction, and this is due to the right hand rule. During the rotational, the magnetic field has no distinct South and North poles since the curling is around the wire (Knight 56). The magnetic field sensor is placed near the current carrying wire centre, and the sensor is given a rotation in order to create the readings. The relationship between the current and the magnetic field strength is given by;
, Whereas the µ0 is permeability constant
Objective
Materials
A compass
A wire with a current
A protractor
A ruler
Procedure
Prepare the compass and align it with North pole
Prepare the wire through plugging it in a 1.5V or 9 V and place the compass directly above the wire
Record on the compass needle the moved angles starting from initial reading position
Measure the distance from the wire using a ruler, and using the earth’s horizontal magnetic component set up a right triangle and obtain the magnitude of the wire’s magnetic field
Record the measured magnetic field data and repeat the procedure in order to obtain multiple results
Predicted results
Readings on the magnetic field sensor
Magnetic field strength at various intervals
Magnetic field of a current carrying wire
Experiment C
Introduction
The quantity of the torque for a magnet is determined by magnetic moment, and the torque is always experienced in the external magnetic field (Cullity & Graham 103). The magnetic field is a vector since it has both direction and magnitude. The magnetic point direction points to the North Pole from the South Pole, and the magnetic field is directly proportional to its moment.
Objective
Materials
Compass
Ruler
Protractor
Paper
Pencil
Bar magnet
Procedure
Ensure the compass is on the table and place the magnet away from you
Place the magnet and the compass in a close range and ensure the reading on the compass needle is 45 degrees
Using the ruler, mark drawings on the paper, and choose the second position on the drawn line
Repeat step 3 above and calculate the magnetic field at the marked points
With 5 positions, move the compass up and down along the drawn line and make your observations on the needle
Create a graph using excel for the 5 values and distances
Works cited
Cullity & Graham. Introduction to magnetic materials. Wiley-IEEE press, 2008, pp. 103.
Print
Knight. Physics for scientists and engineers (2nd ed.). San Francisco, CA: Pearson Education, 2008. Print
