PHYS 101 Lecture 33: Chapter 8-2

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So, the force between two point charges, each one of 1 coulomb, when they are a distance of 1 m apart is: This means that a charge of 1 coulomb is really pretty big! It turns out, not surprisingly, that the charge of the electron (which is the smallest amount of charge in nature), when measured in coulombs is pretty small: E(cid:448)e(cid:374) though the for(cid:373) of ne(cid:449)to(cid:374)"s la(cid:449) of gra(cid:448)itatio(cid:374) a(cid:374)d that of. Coulo(cid:373)(cid:271)"s la(cid:449) of force between electric charges is the same, there are important differences: One involves masses (gravity) the other involves electrical charges (coulomb) Gravitational forces are always attractive while coulomb forces can be repulsive or attractive. The coulomb force is much stronger than the gravitational force; the proportio(cid:374)ality (cid:272)o(cid:374)sta(cid:374)t i(cid:374) ne(cid:449)to(cid:374)"s la(cid:449) of gra(cid:448)ity is. Fe = q1q2 r2 fg = k m1m2 r2 g. Gra(cid:448)itatio(cid:374) coulo(cid:373)(cid:271)"s la(cid:449) (cid:449)hile the (cid:272)o(cid:374)sta(cid:374)t k i(cid:374) coulo(cid:373)(cid:271)"s law is: k = 9 x 109 n m2/c2.

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