PHYS 221L Midterm, Fall 2018

Physics 221L Mid-term November 2018 Please state all (reasonable) assumptions you make about device and component tolerances. 1. You perform the RLC lab experiment; you have no RLC meter. You set the decade resistance box to 20 Ohm; r/ the value printed on the|capacitor is 4.7 nF with a tolerance of 5%! You measure the voltage across the resistor ’~ asa function of the frequency of the function generator (SO Ohm output resistance) to obtain the curve shown below. Draw the circuit you should use; -@stimate the value of the inductor and itgfesistance)) we Using the DMM you created in the lab, you perform a current r measurement and obtain 123.7mV across the 10 Ohm resistor. What is your estimate of the current and what is the resolution of the ammeter. 3. Inthe e/m, experiment the accelerating potential is 22.4(5). The plot of B vs. (1/r) [B=a(1/r)+b] yields a=18.1(1.0) mm-mT ; b= 0.034(21): mT SMe qh -_ The coil dimensions have 2% uncertainty. Calculate e/m. What is the‘earth magnetic field?~ In the capacitance experiment, measurement of capacitance vs. plate separation is given below. Given that the plate diameter is 15.2(2) cm, compute €9. What is the significance of the C-intercept? (4.0,55.8); (6.0,37.1)(8.0,30.4); (10.0,26.1);[d(mm),C(pF)] 5 \ - é ) v “ [Con tv > Qat Xe el bal (124) Qube Lb - (te\ uC Sos Fite