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# act01ans - PHYS-1200 PHYSICS II Class 1 Activity Review of...

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PHYS-1200 PHYSICS II SPRING 2006 Class 1 Activity: Review of Electrostatics ANSWERS 1. The figure shows a small sphere that carries a positive charge of 1.0 ×10 -6 C. It produces an electric field at point P in the diagram. Is it possible to place a charge at point Q in the diagram, such that the electric fields produced at point P by the two charges will add to zero? The charge placed at Q can be of whatever sign and magnitude you choose. (Write the correct answer on your paper.) No, it is not possible. If you chose yes , find the sign and magnitude of the necessary charge. Write your answer in the form shown below Q = ______________ _____ units If you circled no , briefly explain why it is not possible. (Use 25 words or less.) The electric field is a vector, and each charge produces a field at point P. The resultant field at P is the vector sum of those two fields. The fields due to the two charges cannot add to zero, because they are not directed along the same line.

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