The results were plotted as shown in figure 2 below.
The third measurement of electric field was carried out with the charge along the diagonal of the rod. The electric field reduced as the diagonal distance increased, but the numerical calculation was slightly above the exact value of the electric field (Huray, 2009). The results are as shown in figure 3 below:
In this equation, b is the electric field; rl is the distance from the rod to the charge while theta and phi are the two complementary angles between the rod and the charge. Arrow is the actual amount of electric