1. The uniform purely axial magnetic induction required by the experiment in a v
ID: 2295437 • Letter: 1
Question
1. The uniform purely axial magnetic induction required by the experiment in a volume large enough to accommodate the Lorentz Tube is produced by the Helmholtz Coils. What is the magnetic induction due to a coil current 1.5 Ampere? Convert the result in the still popular non-SI unit Gauss (1 Tesla = 10^4 Gauss).
2. In a single measurement student applied electron gun accelerating voltage of 240 V and measured electron orbital diameter of 8 cm. The applied magnetic induction was the same as in Problem 1. What specific charge of the electron follows from the above measurement?
Explanation / Answer
1)
N---> total no of turns
L--> length of the coil
mue = 4*pi*10^-7
B = N*mue*I/L
so, N and L values should be given to calculate B.
2)
workdone on electron, W = q*V
w = 240*1.6*10^-19
W = 3.84*10^-17 J
we know, W = 0.5*m*v^2
==> v = sqrt(2*W/m)
= sqrt(2*3.84*10^-17/9.1*10^-31)
= 9.187*10^6 m/s
Fmax = q*v*B
m*v^2/r = q*v*B
==> q/m = v/(r*B)
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