3.8.5　Data recording and processing

3.8.5　Data recording and processing

1)Data recording

Record observations in Table 3.8.1 and Table 3.8.2,respectively.

Table 3.8.1　Record of coaxial cable electrostatic field description experiment

Table 3.8.2　Record of coaxial cable radius measurement and calculation(Unit:cm)

2)Data processing

(1)Calculation of radius R1 and R2 of two cylindrical surfaces by the least square method.

According to Equation(3.8.9),it can be concluded as:(https://www.daowen.com)

It can be seen that there is a linear relationship between Ur/U0 and ln r.If y=Ur/U0,x=ln r,then y=kx+b can be obtained.

then

Where,

(2)Calculation of relative error:

(The theoretical values of R1 and R2 are 0.5 and 7.5 cm,respectively.)