Question

aboratory Manual for Physics 102 Laboratory Manual for Physics 102 Pre-Lab for Experiment 01: A: Given what you know about the magnetic field generated by a circular moving current in a wire, sketch an approximation of what the field between the two Helmholtz coils will look like for the lab. The use this sketch to justify why we can approximate the field as being uniform and perpendicular to the beam path of the electrons in the CRT ヲ B: Show that a plot of D versus I yields a linear slope given the constants for the lab and what the value of that slope is C: Solve your equation from pre-lab B above for will allow us to experimentally calculate the value from our slope given a constant accelerating voltag Triton College Page 41

Answer 1

(A) A, B are two Helmholtz coins. Look at the middle of the coin where (at point D) magnetic field is linear to the axis of the coils. Current is circulating in there coils also electrons are circulating insider the coils than of we draw any tangent above any point on the coil it indicator the direction of e^- velocity, say in the direction of x-(axis) or y(axis) and y axis always indicates direction of magnetic field, run we can justify field as uniform & perpendicular to beam path of electron (B) D is related to E (e.m.f) an D = e. t (E - perpendicularity medium) we know from faraday's law s = -dphi/dt = -d/dt (LI) L - self inductance thus D = e^' E = -E L dI/dt dI = -D/EL dt I = -D/EL t + K slope in dI/dD = -t/EL (c) we know lonentz force F = m dv/dt = e VB