Electric fields

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Question 9
Easy

Figure 3 shows a graph and a table of electric field strength against distance, ddd, from a charged sphere.

Graph of electric field strength in N/C against distance d in cm. The curve starts at a high electric field strength for small distances and decreases rapidly as distance increases, forming an inverse-square curve.

Data Table

Distance d d\,d in cmElectric field strength in N/C
2.036000
3.016000
4.09000
6.04000
8.02250

The equation relating electric field strength to distance, ddd, is

electric field strength=kd2 \text{electric field strength} = \frac{k}{d^2} electric field strength=d2k​

where k k\,k is a constant.

Using data from Figure 3, calculate the value of k k\,k when d=3.0d = 3.0d=3.0 cm.

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Electric fields Questions

  1. GCSE
  2. /Physics
  3. /Electric fields