(4) e/m = v/Br
(5) B=(N)(I)8μ0/R(√125) , N is the number of turns on each coil, I is the current, R is the radius, and μ0 = 4pi x 10-7 Tm/A.
(8) v = (2eV/m)^1/2
Using Equations 4, 5, and 8, solve for e/m in terms of r (radius of the path), R (average radius of the coils), V (voltage of the electron source), I (current in the coils), N (number of turns of the coils) and constants. Hint: start by putting 5 and 8 into 4.
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