THE DIRECTION OF BAR-MAGNET

Bab IV. Magnetism
THE DIRECTION OF BAR-MAGNET
I. Objective:
Observe bar-magnet direction of motion
II. Equipment and Materials:
a. a bar-magnet
b. a statif
c. yarn
III. Basic theory:
Anyone who has played around with magnets knows that magnet exerts force on one another. Magnetic force are similar to electrical forces, in that magnets can both atrrac and repel without touching (depending on which ends of the magnets are held near one another), and the strength of their interaction depends to the distance between them. Whereas, electric charge produce electrick forces, region called magnetic poles give rise to magnetic forces.
If you suspend a bar magnet at its center by a piece of string, you’ve got a compass. One end, called the north-seeking pole, points northward. The opposites end, called the south seeking pole, point southward. More simply these are called the north and south poles. ( Hewitt, Paul G.;2007 : 131)
IV. Procedures
1. Determine both bar magnetic pole. Usually magnet north pole is given to ruddle, while the south pole given by blue colour.
2. Hang one of bar-magnet at statif with yarn causing can make a move Free. Pay attention to below picture.

3. Divert magnet then discharge.
4. Let calm magnet and don't oscillate again.


V. Observation Table
North Pole direction of motion South Pole direction of motion Description




VI. Question
1. Which direction appointed by north pole of magnet?
2. Which direction appointed by south pole of magnet?











Refference
Abdullah, mikrajuddin. 2004. IPA FISIKA 3. Jakarta: Erlangga
Abisabrina.wordpress.com/2010/08/13/hukum-ohm-dan-rangkaian-seri-paralel/
Hewitt, Paul G., dkk. 2007. Conceptual Integrated Sccience. San Fransisco: United States
Kanginan, Marthen. 2004. Sains Fisika SMP semester 1. Jakarta: Erlangga
Panitia Sertifikasi Guru. 2010. Ilmu Pengetahuan Alam SMP (Buku 2). Yogyakarta: UNY