What happens when there is no electric field?
There must be a charge to create the field, but the charge does not have to be at that point, there is an electric field in the area around the charge. There cannot be a charge at a place where there is no electric field because the charge would create an electric field.
Can there be current without electric field?
Second, in the case of an ideal conductor, there can be a steady current through without an electric field inside. Recall that an electric field accelerates electric charge. For a steady current without dissipation, no electric field is required to sustain the current.
Do electric fields ever end?
The complication is that usually electrons do the moving but the electric field, our model of how the space is affected, is based on the movement of a positive test charge. In simple terms, at least one end of an electric field line does not need to end anywhere other than infinity.
What happens when an electric field changes?
The correct interpretation in the opposite way is that a “changing” electric field produces a magnetic field. A current carrying wire produces a magnetic field around it, given by Biot-Savart’s law. The most general concept is that a moving charge creates a magnetic field in the region around it.
Why are electric fields important?
Electric fields provide us with the pushing force we need to induce current flow. An electric field in a circuit is like an electron pump: a large source of negative charges that can propel electrons, which will flow through the circuit towards the positive lump of charges.
Why is there no electric field in a conductor?
The conductor does not have charge inside it because all the charges travel to the surface if given, therefore if we give any charge to conductor it will travel to the surface and therefore no charge inside conductor and thus no electric field.
Do electric fields go to infinity?
So there is no infinity. In two dimensions (or in one), the electric field falls off only like 1r so the potential energy is infinite, and objects thrown apart get infinite speed in the analogous two-dimensional situation.
What causes electric field change?
A current carrying wire produces a magnetic field around it, given by Biot-Savart’s law. The most general concept is that a moving charge creates a magnetic field in the region around it. A moving charge means that Electric field “changes” with time.