Physics307L F08:People/Gleicher/Notebook/071022

--Erron C. Gleicher 15:57, 22 October 2007 (CDT)

e/m

		I (held constant)= 1.52 A	V	r (cm) (right side)	r (cm) (left side)	r average
		296	5.5	6.5	6
		311	5.5	7.1	6.3
		325	6.0	6.3	6.15
		340	6.0	7.3	6.65
		355	6.2	7.0	6.6
		370	5.8	7.2	6.5
		385	6.2	7.4	6.8
		400	6.3	7.5	6.9
		416	6.5	7.5	7
		430	6.5	7.5	7
		445	6.5	7.5	7
		454	6.5	7.8

	constant voltage	Current (ampheres)	r (right side) (cm)	r (left side) (cm)	r average (cm)
	454 V	2.25	7	6	6.5
		2.1	5.5	5	5.25
		1.95	6.5	5.3	5.9
		1.79	6.5	6	6.25
		1.65	6.75	6	6.37
		1.50	7	6.5	6.75
		1.35	7.5	7	7.25
		1.2	7.5	7.75	7.675

Initial theory

F=qvB

ma = mv^2/r

qvB = mv^2/r

qB = mv/r

q/m = v/(rB)

Since both q (=e) and m (=mass of the electron) are constant then v/(rB) should be constant.