Table of Contents
Does magnetic field depend on area?
The magnetic field is strongest in the area closest to the wire, and its direction depends upon the direction of the current that produces the field, as illustrated in this interactive animation.
Does electric field depends on area of cross section?
The electric current remains constant in the wire so that no charge accumulates in the wire. The drift speed and current density depends on the area of cross section and hence they do not remain constant. From the relation j=σE, it can be deduced that the electric field does not remain constant.
What do magnetic fields depend on?
The motion of electrically charged particles gives rise to magnetism. The force acting on an electrically charged particle in a magnetic field depends on the magnitude of the charge, the velocity of the particle, and the strength of the magnetic field. All materials experience magnetism, some more strongly than others.
When a wire is perpendicular to the magnetic field the force acting on the wire is?
When the current is parallel to the magnetic field lines, the force is zero, and when the current is perpendicular to the magnetic field lines, the force is at a maximum.
How is electric field related to area?
The electric field is along x-axis (say), when the area is tilted to make an angle with y-axis, the electric field remained same but the field lines passing through it becomes lesser.
Does free electron density depend on area of cross section?
Free electron are depends on how many electrons are there in the conduction band per atom, and number of atoms per unit volume. This is independent of area of cross section. So free electron does not depends of area of cross section.
Why does a wire produce a magnetic field?
One of the electrons of the atoms that make up a conductor is free to move. A potential difference across the conductor pushes the electrons and moving electrons produce a magnetic field.
Why is there a magnetic field around a wire?
When a current flows in a wire, it creates a circular magnetic field around the wire. This magnetic field can deflect the needle of a magnetic compass. The strength of the magnetic field is greater closer to the wire, and increases if the current increases.
How does resistance depend on cross-sectional area?
Resistance is Inversely proportional to cross sectional area.. Explanation: this is because, if area of cross section increases, there will be more area for flow of electrons in the direction opposite to current.. and thus resistance (opposition of flow of electrons) becomes low.
How does a magnetic field affect the direction of current?
One wire sets up a magnetic field that influences the other wire, and vice versa. When the current goes the same way in the two wires, the force is attractive. When the currents go opposite ways, the force is repulsive.
What force does a magnetic field exert on a current carrying wire?
The magnetic force on a current-carrying wire. A magnetic field will exert a force on a single moving charge, so it follows that it will also exert a force on a current, which is a collection of moving charges. The force experienced by a wire of length l carrying a current I in a magnetic field B is given by.
What is a magnetic field?
Magnetic field: 1) A moving charge or current creates a magnetic field in the surrounding space (in addition to E). 2) The magnetic field exerts a force F m on any other moving charge or current present in that field. – The magnetic field is a vector field vector quantity associated with each point in space.
How does a magnet interact with a moving charge?
Magnetic Field. Interaction of magnetic force and charge – The moving charge interacts with the fixed magnet. The force between them is at a maximum when the velocity of the charge is perpendicular to the magnetic field.
https://www.youtube.com/watch?v=vZoZYsK5Fu0