Charged object A (QA) creates an electric field (E). A positively-charged test charge (qB) is used to measure the electric force (F) at various distances (d) from object A. Express your understanding of electric field strength and electric force by filling in the following table. (Note that the units on charge are fictitious units. Since the value of k is not known in these units, you will have to use your qualitative understanding to answer this question.  That is, you will have to think about relationships - the effect that doubling or quadrupling or halving ... the d or the Q has upon the force and the field strength.)   QA (bP) qB (bP) d (m) F (mN) E (mN/bP) a. 10.0 0.400 1.00 40.0   b. 10.0 0.800 1.00     c. 10.0 0.400     25.0 d. 20.0 0.400 1.00   200. e. 20.0 0.400 2.00     f. 20.0 0.400 0.500     g. 20.0 1.20 3.00

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.