Any external field applied to a perfect conductor
Is the magnetic field ever zero?
It’s not really true that magnetic field lines cannot cross, but
where they do, the magnetic field strength has to be zero
. Here’s why: A magnetic field line is that path in space that points in the direction of the magnetic field at every point along it.
Is there a magnetic field in a conductor?
Whenever current travels through a conductor, a magnetic field is generated
. Whenever current travels through a conductor, a magnetic field is generated, a fact famously stumbled upon by Hans Christian Ørsted around 1820. Depending on the shape of the conductor, the contour of the magnetic field will vary.
Where is a magnetic field zero?
There is no place where the magnetic field goes to zero
. At the magnetic poles a compass would spin around uselessly but that is because the magnetic field no longer has a horizontal component, but is completely vertical. You can’t measure a vertical magnetic field with a horizontally oriented compass.
Why magnetic field inside a conductor is not zero?
Due
to a large number of electrons
, the force of repulsion acting in between them is also very high. Hence in order to minimize the repulsion between electrons, the electrons move to the surface of the conductor. Hence we can say that the net charge inside the conductor is zero.
Is the electric field inside a conductor zero?
The electric field is zero inside a conductor
. Just outside a conductor, the electric field lines are perpendicular to its surface, ending or beginning on charges on the surface. Any excess charge resides entirely on the surface or surfaces of a conductor.
What is H in magnetic field?
The definition of H is
H = B/μ − M
, where B is the magnetic flux density, a measure of the actual magnetic field within a material considered as a concentration of magnetic field lines, or flux, per unit cross-sectional area; μ is the magnetic permeability; and M is the magnetization. …
Why can’t magnetic field lines cross?
The magnetic field lines never intersect each other because if two or more lines intersect each other than it means
that at that point of intersection, the magnetic field has two directions at the same point
. This is not possible for a magnetic field to point in more than one direction at the same point.
Can magnets interact without touching?
Magnetic forces are
non contact forces
; they pull or push on objects without touching them. Magnets are only attracted to a few ‘magnetic’ metals and not all matter. Magnets are attracted to and repel other magnets.
What happens when magnetic field zero?
Since the velocity and magnetic field are parallel to each other, there is no orientation of your hand that will result in a force direction. Therefore,
the force on this moving charge is zero
.
What is L in magnetic field?
Magnetic Force on a Current
B is the magnetic field strength (or flux density) of the field the charge is in (I.e The number of magnetic field lines per unit area) – measured in Teslas (T). I is current of the current – measured in amperes (A). L
is the length of conductor in the magnetic field – measured in meters (m)
What is the magnetic field inside a perfect conductor?
In perfect conductors, the interior magnetic field
must remain fixed but can have a zero or nonzero value
. In real superconductors, all magnetic flux is expelled during the phase transition to superconductivity (the Meissner effect), and the magnetic field is always zero within the bulk of the superconductor.
Can a static magnetic field exist in a good conductor?
The electric and magnetic components must exist together. In terms of statics, a
magnetic field can exist in a perfect electrical conductor
although I think one may argue that such a state is a bit ill-posed.
Can magnetic fields cross?
Magnetic field lines can never cross
, meaning that the field is unique at any point in space. Magnetic field lines are continuous, forming closed loops without beginning or end. They go from the north pole to the south pole.
Where do magnetic fields point?
They point from
the north pole to the south pole
. However, the magnetic field lines do not just end at the tip of the magnet. They go right through it, so that inside the magnet the magnetic field points from the south pole to the north pole.
What happens when magnetic fields overlap?
When magnets are close together, with their fields overlapping,
the fields combine to produce a resultant field which acts in one direction at any given point
. The point X is called a neutral point. The forces due to both magnets cancel each other, i.e. there is no net force, at X.
