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Physics II (PHY – 1203) Laboratory experiment 2 “Magnetic Field”
Student Name
Student ID
Teacher Name
Date & day of experiment
Date & day of submission
Maitha aldhaheri
H00268869
Mohammad muflhi
16/4/2014, wed.
30/4/ 2014, wed.
Page 1 of 4
Purpose: The purpose of this experiment is to investigate and analyze the magnetic field. Theory: Every magnet is surrounded by a space in which its magnetic effects are present. Such regions are called magnetic fields. Just as electric field lines were useful in describing electric fields, magnetic field lines, called magnetic flux lines, are useful f or visualizing magnetic fields. Abstract:
In this experiment we saw how magnetic bar field act when there’s a compass and the relationship between compass and field vector. And using a compass can determine the location of S and N of magnetic bar For the second part (magnetic field loop) : we determine the direction of current using right hand thumb rule plus we determine the magnetic field strength.
Page 2 of 4
Procedure 1 & Data (Magnetic Bar Field Model): 1. Run the simulation file (ejs_em_MagneticBarField ). 2. Move the compass around in the magnetic field of the magnet and move the magnet around. What is the relation between the compass and the field vector (small arrows)? The field vector arrows are moving the same direction of compass they have a direct relation. 3. Click on the Radomize position check box. 4. Click the Hide Field button. 5. Test to see how well you can use the compass to determine the location of the magnet: Use the compass to show the direction of the magnetic field and then move the marker (same size as the magnet) to where you think the magnet is located. Click on Show Field to see if you were correct. If you were, describe your strategy. If you weren't, explain what went wrong and try again. My strategy was using the compass to determine the location of N and S so when its blue(compass arrow) that’s means it directed toward N of the magnet and vice versa.
Page 3 of 4
Procedure 2 & Data (Magnetic Field from Loops): 1. Run the simulation file (ejs_ntnu_em_MagneticFieldFromLoops). 2. Watch the simulation as the field changes from the field around a long straight currentcarrying wire to the field near a coil. 3. There is an arrow on each end of the wire (red and blue). Which one shows the direction of the current in the wire? Explain. Red arrow because its goes with current direction when we used right hand thumb rule and the direction of magnetics field goes to right. 4. The simulation also shows the magnetic flux. What do the colors represent? Represents : the magnetic field direction and its strength (strong or week ) Do the blue arrows represent a stronger or a weaker magnetic field strength? A blue arrow shows weaker magnetic field strength
Page 4 of 4
Evaluation and Review Questions: 1. Define the following: a) Law of Magnetic Force: may be generated by electric charges in motion, and an electric force may be generated by a magnetic field in motion. b) Magnetic Induction: This theory of magnetism is highly plausible because it offers an explanation for many of the observed magnetic effects of matter. c) Retentivity: The ability to retain magnetism is referred to as retentivity d) Magnetic Saturation: Another property of magnetic materials that is explained easily by the domain theory 2. State the Right-Hand Rule:
Extend the right hand with the fingers pointing in the direction of the B field and the thumb pointing in the direction of the velocity v of the moving charge. The open palm will be facing in the direction of the magnetic force F on a positive charge. 3.State the Right-Hand-Thumb Rule:
A convenient method devised by Ampère to determine the direction of the field surrounding a straight wire.
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3. What is the magnetic induction in air at a point 2 cm from a long wire carrying a current of 15 mA?
4. A circular coil has having 60 turns has a radius of 75 mm. What current must exist in the coil to produce a flux density of 300 µT at the centre of the coil?
