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Electricity in the nervous system

What are most important concepts and equations one must know about current, resistance and circuits. Including but not limited to batteries and EMF, connecting potential and current, Resistors and Ohm's law, Energy and power, Kirchhoff's Law, Series and parallel circuits, Measuring voltage and current, complex circuits, household electricity, capacitors in parallel and in series, RC circuits, and electricity in the nervous system.

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## Q : When electric field along the negative x axis becomes zero

A charge of +22.2 C is at the origin. When charge Q is placed at 2 m along the positive x axis, the electric field at 2 m along the negative x axis becomes zero. What is the value of Q? Express the answer with one decimal place.