PHYSICS 7D Lecture Notes - Lecture 16: Electric Flux
PHYSICS 7D verified notes
16/20View all
Document Summary
Physics 7d lecture 16: magnetic field and magnetic forces: magnetic force on a current. A b field produces force on electrons moving in wire, force transmitted to the wire. Force on each electron f b on e =q e v d x b. Look at total force on length l. number of electrons in the element n=nal. n= number of electrons/unit volume. F= nalq e xb= il x b i=naq e v d (check units) Units of b given by n/a/m or ns/c/m. Force on a straight current-carrying wire: f=il x b: l b => If wire is not straight, look at small segments ds: df = lds x b. Total force: f = df = lds x b. F= qv x b : charged particle. F= il x b : straight wire df =ids x b : a small segment of wire. Lines tangent to b through any moving point. Force on a moving charge perpendicular to field lines.
