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Physics 21 Online
OpenStudy (anonymous):

2. The strength of an electric field at 2.4 m from a point charge is 250.0 N/C. What is the magnitude of the source charge?

OpenStudy (anonymous):

Does this help? http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html#c1

OpenStudy (anonymous):

Oops, http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html#c2. k is coulomb's constant.

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