Find the experimental value of e/m from the given data (Charge-to-Mass Ratio:data). The table for value of voltage(v), Radii(m), Magnetic filed(T) and theoretical value of e/m are given at charge to mass Ratio: data section. The formula and equations are provided at charge to mass ratio lab instruction-write up.pdf. Just before the explanation of the experimental set up section of write up, you will see the equation
2V/B^2=e/m r^2.
This equation is required to generate the graph. our y= 2V/B^2 slope(m)=e/m and x=r^2. So in the Excel you make column for y and x . plot y vs x. Do lines fit. the value of slope obtained from lines fit will be your experimental value of e/m now calculate the percentage difference of your experimental and theoretical value of e/m.
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