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The paper discusses the development and evaluation of five research-based tutorials on Coulomb's law, superposition, symmetry and Gauss's Law to help students in the calculus-based introductory physics courses learn these concepts. They compare the performance of students on the pre-/post-tests given before and after the tutorials in three calculus-based introductory physics courses. They also compare the performance of students who used the tutorials and those who did not use it on a multiple-choice test which employs concepts covered in the tutorials.
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