Special relativity and Physics Stack Exchange
Electromagnetism - Why Moving Charge And A Current Carrying Wire Creates Magnetic Fields - Physics Stack Exchange. Then it follows from these two postulates alone that the electromagnetic force must precisely decompose into two components: Einstein theory of special relativity brings the concept of length contraction.
The current carrying wire doesn't apply any magnetic force on nearby charge $q$ ( positive stationary charge) because it has 0 velocity in lab frame. A current is induced in a wire coil when it is put in a changing magnetic field. This is at the ap physics level. We found that there is no force on q by wire. There is no exact reason as to why a current in a straight wire creates a circular magnetic field. In classical physics a stationary charge produces an electric field with straight lines of electric flux, where as a moving electric charge has curved lines of electric flux because changes in the electric field propagate through space limited by the speed of light the further from the electron in space, the more the electric field lags behind the current position of the electron. Electric current is generated by a changing magnetic field, which causes current to flow in the conductor. This changing magnetic field generates an electric field that drives the charges around the wire, causing current to flow. Electromagnetism which way will a current carrying. The charge moving slower/same speed/faster than the current carrying electrons just increases the force, it doesn't lead to change in the direction of force.
The charge is moving so we have to determine the field an. Moving the charge in one direction leads to attraction but moving it in the opposite direction causes repulsion, and not moving leads to no force. You can make the magnetic field from the electromagnet even stronger by placing a piece of iron inside the coils of wire. Students who viewed this also studied. The definition of magnetic field of an isolated moving charge allows us to understand how the magnetic field is determined for other moving charge distributions, that is current or collection of currents. This is known as an electromagnet. A current is induced in a wire coil when it is put in a changing magnetic field. When a charged particle is stationary in a magnetic field, it experiences no magnetic force that might accelerate it. All the rules (the right hand thumb rule and others) are based on this property. Now let's determine the magnetic field of a moving charge at a field point $p$ at a particular instant of the motion. The current carrying wire doesn't apply any magnetic force on nearby charge $q$ ( positive stationary charge) because it has 0 velocity in lab frame.
