Summary
magnets have two poles; like poles repel and unlike poles attract; poles cannot exist without each-other. Magnets attract some objects and have no effects on others
magnets have no effect on stationary charges
field lines can be used to represent magnetic field at all points in space
current-carrying wire produces a magnetic field and interacts with other magnets
all magnetic fields originate from current loops.
the Earth’s magnetism is still a mystery, its strength at the surface is ~ 5 x 10-5 T
a charged particle moving in magnetic field experiences force at right angles to its velocity and to the magnetic field.
If the number of magnetic lines passing through a loop of wire changes for any reason, a current is produced in the loop
Connections between electricity and magnetism are best expressed in terms of the fields
Changing magnetic field can generate changing electric field, and changing electric field can generate a changing magnetic field, creating electromagnetic waves
Electromagnetic waves are transverse waves, and travel with the speed of light
Home-work: Part I. 542/1-5; 543/6-11,13-17,20; 544/21,22; 546/1-10
Part II. 544/27-30,33-38; 545/39-43,45,46,49,50,52,55-57;
546/58-62,11-15,19,20; 547/21,22