PHY 132 Lecture Notes - Lecture 7: Beam Diameter, Helmholtz Coil, Memory Stick
Document Summary
Abstract: this lab investigated an electron"s charge-to-mass ratio by taking electrostatic force and then magnetic force to accelerate an electron for a". 0. 1501 m, which was off from the theoretical value of 0. 15m by about 0. 067%. A graph comparing b to (1/r) was fitted. The slope for 0 degrees was found to be 5. 426 x 10-5 4. 826 x. 10-7(t-m) while the slope at 180 degrees was 5. 354 x 10-5 4. 087 x 10 -7 (t-m). The charge-to- mass ratio from the 0 degree graph was 2. 09*1011 3. 20e+09 c/kg while the 180 degree graph yielded 2. 04*1011 3. 63e+09 (c/kg). These values yielded percent errors of 18. 9% and 15. 8%. The b value was calculated to be 1. 19*10-3 t. the graph looked to plot values of the changing voltages (v) by the radius squared (m2). 1. 406 x 105 3470(v/m2) while the slope at 180 degrees was 1. 533 x 105 1369 (v/m2).
