PHYS 102 Chapter 28: Chapter 28 Notes

• School: Drexel University
• Department: Physics
• Course: PHYS 102
• Professor: Aprelev Alexey

Document Summary

Both permanent magnets and electric current s in electromagnets create magnetic fields. A charge creates an electric field and an electric field exerts a force on a charge. Magnetic fields exert forces only on moving charges. A(cid:373)pe(cid:396)e"s la(cid:449) pla(cid:455)s a (cid:396)ole i(cid:374) (cid:373)ag(cid:374)etis(cid:373) a(cid:374)alogous to the (cid:396)ole of gauss"s la(cid:449) i(cid:374) ele(cid:272)t(cid:396)ostati(cid:272)s. Moving charged particles within atoms respond to magnetic fields nad can also act as sources of magnetic fields. Magnetic fields are produced by tremendous numbers of charged particles moving together in a current. The source point is the location of the moving charge at a given instant. The field point is the point p where we want to find the field. The direction of b is not along the lie from source point to field point: b is pe(cid:396)pe(cid:374)di(cid:272)ula(cid:396) to the pla(cid:374)e (cid:272)o(cid:374)tai(cid:374)i(cid:374)g this li(cid:374)e a(cid:374)d the pa(cid:396)ti(cid:272)le"s (cid:448)elo(cid:272)it(cid:455) (cid:448)e(cid:272)to(cid:396) (cid:448). The field magnitude b is proportional to the particles speed v and sin .