In an experiment, we place a test charge inside a box, in order to check whether

Question

In an experiment, we place a test charge inside a box, in order to check whether there is an electric field in the space inside the box. The test charge feels a force, therefore, by definition, an electric field exists inside the box. Does that mean that there must be other charges inside the box too?

a. Yes, electric fields are created by charges, therefore these charges must be there too.
b. Yes, the fact that the test charge feels a force means that another charge is there to provide the force, according to the formula F=kq1q2/r2.
c. No, the electric field that we measured was caused by the test charge itself, according to the formula E=kq/r2.
d. Not necessarily: a region of space can have an electric field with no charges present in that region.

Explanation / Answer

d. Not necessarily: a region of space can have an electric field with no charges present in that region.

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