Lab 6: Kirchhoff’s Rules Name _____________________________ Date___________ Lab Partner(s) _____________________________________ Laboratory Report NOTE: Show all your calculations. If needed, include...

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Lab 6: Kirchhoff’s Rules Name _____________________________ Date___________ Lab Partner(s) _____________________________________ Laboratory Report NOTE: Show all your calculations. If needed, include additional pages, or do your work on a separate sheet and insert a scanned copy or picture to your lab report. Your grade will drastically be reduced if no work is shown. Purpose: To determine the charge to mass ratio of the electron. DATA ANALYSIS Data Set Accel Voltage (V) Magnet Current (A) Current^2 (A2) Beam Radius (cm) 1 2 3 4 5 1) Use Excel to plot a graph of V vs I2 (values of V on the vertical axis and I2 on the horizontal axis.) 2) Fit the data with a linear trendline and determine the slope and the uncertainty in the slope. Show the equation of the line on the graph. 3) Insert a screenshot of your Excel graph showing title, axes’ scales and labels, and best-fit line. 4) Use the value of the slope to determine your experimental value of the electron’s e/m ratio. (Hint: the slope of the graph is V/I2. Remember to convert all values to SI units before doing any calculations.) 5) Calculate the percentage error in e/m [(e/m)accepted ] Calculations: (Show all your work to find e/m and % error) Questions 1. The magnetic force acting on a charged particle can never do work because at every instant the force is perpendicular to the velocity. The torque exerted by a magnetic field can do work on a current loop when the loop rotates. Explain how these seemingly contradictory statements can be reconciled. 2. A metal ring carries a current that causes a magnetic field B0 at the center of the ring and a field B at point P a distance x from the center along the axis of the ring. If the radius of the ring is doubled, find the magnetic field at the center. Will the field at point P change by the same factor? Why? Show your calculations and explain. CONCLUSION