Use Task Manager. Another way of opening File Explorer is to use the Task Manager. You'll have to open Task Manager, switch to More details, select the File menu and then click or tap on Run new task. Inside the Create new task window, write explorer and press Enter or OK.
Sources of electric field. Causes and description. Electric fields are caused by electric charges or varying magnetic fields. The former effect is described by Gauss's law, the latter by Faraday's law of induction, which together are enough to define the behavior of the electric field as a function of charge repartition and magnetic field.
The electric field from a positive charge points away from the charge; the electric field from a negative charge points toward the charge. Like the electric force, the electric field E is a vector. If the electric field at a particular point is known, the force a charge q experiences when it is placed at that point is given by : F = qE. If q is positive, the force is in the same direction as the field; if q is negative, the force is in the opposite direction as the field.