Peoples Physics Concepts

14.1. Magnetic Fields http://www.ck12.org

B=

μoI

2 πr

r=

μoI

2 πB

r=

4 π∗ 10 −^7 Tm/A∗300 A

2 π∗ 4 ∗ 10 −^5 T

r= 1 .5 m

Watch this Explanation

MEDIA

Click image to the left for use the URL below.

URL: http://www.ck12.org/flx/render/embeddedobject/324

Simulation

Magnet and Compass (PhET Simulation)

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1. Sketch the magnetic field lines for the horseshoe magnet shown here. Then, show the direction in which the
   two compasses (shown as circles) should point considering their positions. In other words, draw an arrow in
   the compass that represents North in relation to the compass magnet.