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.
Electromagnetic fields at low frequencies. Electric fields exist whenever a positive or negative electrical charge is present. They exert forces on other charges within the field. The strength of the electric field is measured in volts per metre (V/m).