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### Lab20 Static Electric Charge

Course: PHYSICS 1A+1B, Fall 2010
School: Laney College
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Word Count: 377

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Electric Lab4 Static Charge Instructor: Dr. Mohebi Jiajie Huo(Jacky) Member: Ruihong Xiao TEJ Shiwakoti Anthony Hernandez Dana Saiez Rneiang Ye WAJIH RAHMAN 2. introduction. In this experiment, we are generally focusing on determining the relatice effectiveness of various materials in transferring charge to a pith ball. 1. F=kqq/r^2, while F refers to the electrical force, k refers to the coefficient of the...

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Coursehero >> California >> Laney College >> PHYSICS 1A+1B

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Electric Lab4 Static Charge Instructor: Dr. Mohebi Jiajie Huo(Jacky) Member: Ruihong Xiao TEJ Shiwakoti Anthony Hernandez Dana Saiez Rneiang Ye WAJIH RAHMAN 2. introduction. In this experiment, we are generally focusing on determining the relatice effectiveness of various materials in transferring charge to a pith ball. 1. F=kqq/r^2, while F refers to the electrical force, k refers to the coefficient of the electricity force, q refers to the charge the balls have. 2. G=mg, while G refers to the gravitational magnitude of the object, m refers to the mass of it, while g refers to the gravitational efficient. 3. Ne=Q/e, while Q refers to the charge of the object, e refers to the charge of the electron. 3. Procedure.(additional: all temperature are in degree.) a. Measure the mass of the pitch balls. M=0.1g. b. we choose the silk and a robs, place a static electric charge on them, and place the charge on the two balls. c. Measure the distance the two balls repulsive effect. D=1.6cm e. repeat the above procedure using different materials. 3. Date sheets, spread sheets. Rod robber plastic robber plastic glass plastic Measured L(m) Date Calculation D(cm Material ) m(g) angle(o) Q(c) Ne Microther 0 0.1 0.193 0 silk 1.6 0.1 0.193 4.8 1.10E-09 6.88E+09 silk 0 0.1 0.193 0 silk 1.2 0.1 0.193 3.6 7.00E-10 4.38E+09 microther 0 0.1 0.193 0 silk 0 0.1 0.193 0 Sample calculation: tan/2=F/mg=d/2Lcos/2,mg=0.98kg*N,L=0.193m,d=0.016m, =4.8o, F=kQQ/r^2 Q=sqrt[mgtan(/2)*r^2/k]=1.1e-9. Ne=Q/e=1.1e-9/1.6e-19=6.875e+9 6. Discussion and conclusion. In this experiment, we came across many problems, the first is the rob can not get charged while mopping with the silk or any kind of material except the plastic, so there are several kinds of measure is missing. Secondly, when the plastic get charged, it is hard to get the balls get charged and separate them by the electric force, so we do it a lot more times. However, we successfully get two set of answers and the angle of them is 4.8 o and 3.6o separately, and the final Q is 1.1e-9 and 7.0e-10, the Ne would be 6.875e+9 and 4.375e+9, and we concluded that the magnitude of the Ne is the same as that of the actual one, so we think it is success in this rude experiment.
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