Without current there is no magnetic field and without voltage – no electric field. Under static conditions, either can exist w/o the other. A superconducting loop w/ a steady dc current has magnetic field, but no electric field.
Can there be an electric field without current?
There is no net electric field because there are equal numbers of positive and negative charges so their fields balance out. However there is a magnetic dipole due to the motion of the electrons. No you can have a magnetic field without an electric field.
Does current cause electric field?
Yes, an electric current =does= produce an electric field. This is due to relativity, specifically the Lorentz Contraction.
Can the electric field be negative?
Electric field is not negative. It is a vector and thus has negative and positive directions. An electron being negatively charged experiences a force against the direction of the field.
Why do we need the electric field?
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 current does not produce electric field?
As we know that a current carrying conductor, such as a metal wire will produce a magnetic field around it, the motion of charge around the wire in the form of concentric circles. … So, the conductor does not induce any electric field around itself.
Why there is no electric field around a current carrying conductor?
There is no E field outside the conductor due to electrons because the conductor is not charged–this means there exist an equal number of protons to every electron in the conductor. If the conductor was charged, then there would be E field outside the conductor due to that charge.
Are electric fields always positive?
An electric field is a vector field, it has both magnitude and direction. In vector theory, the magnitude is the “size” of the vector and, like spatial sizes, is always positive.
Are electric fields infinite?
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.
How do you know if an electric field is positive or negative?
The electric field is a vector field around a charged particle. … If the point charge is positive, field lines point away from it; if the charge is negative, field lines point toward it.
How are electric fields used in real life?
In daily life everybody is, to a greater or lesser degree, exposed to electromagnetic fields. Examples are the fields produced by kitchen appliances, radio transmitters and mobile phones.
Is it possible for an electric field to exist at some point in space at which there is no charge?
Q20 Is it possible for an electric field to exist at some point in space at which there is no charge? Yes, all we need to have is a charge somewhere in space that can exert a force on a positive test charge brought to that point in space.
How important is electricity in your life?
Electricity is an essential part of modern life and important to the U.S. economy. People use electricity for lighting, heating, cooling, and refrigeration and for operating appliances, computers, electronics, machinery, and public transportation systems.