Special relativity and Physics Stack Exchange
Electromagnetism - Why Moving Charge And A Current Carrying Wire Creates Magnetic Fields - Physics Stack Exchange. But if we take a moving frame then, q is in relative motion and hence a current carrying wire applies a magnetic force on q. Let's denote this magnetic force in moving frame by
This is at the ap physics level. 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. Hi saurav, if you know basic electrostatics and basic special relativity, then you can understand why magnetic forces are necessary in order for the laws of physics to be consistent. 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. You can obtain an even stronger magnetic field by wrapping a coil of wire in a series of loops known as a solenoid and flowing current through the wire. 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. Einstein theory of special relativity brings the concept of length contraction. 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. This video is a part of pebbles ap board & ts board syllabus live teaching videos pack.
There is no exact reason as to why a current in a straight wire creates a circular magnetic field. 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. 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. 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. Then it follows from these two postulates alone that the electromagnetic force must precisely decompose into two components: But more than that, a magnetic field is a cross product field and cannot perform any work on a charged particle. The second right hand rule tells you the direction of the magnetic field. Nassau community college • phy sample. This is response of h c verma to this question asked by a class 10 student This video is a part of pebbles ap board & ts board syllabus live teaching videos pack.
