The magnetic field from a wire
decreases
with distance from the wire. Instead of the field being proportional to the inverse square of the distance, as is the electric field from a point charge, the magnetic field is inversely proportional to the distance from the wire.
What is infinitely long wire?
For an infinitely long straight wire,
the magnetic field lines are circles centered on the wire
. The direction is given by a right-hand rule: With your right hand, point your thumb in the direction of the current. When you curl your fingers they curl in the direction of the magnetic field.
At what distance does a long straight wire carry a current?
The answer is
1.71 cm
.
What is the magnetic field pattern for a straight wire carrying a current?
The Magnetic field lines around a straight conductor carrying current are
concentric circles whose centres lie on the wire
. The direction of magnetic field lines can be determined using Right-Hand Thumb Rule.
What is the shape of the magnetic field of a long straight wire?
The field around a long straight wire is found to be in
circular loops
. The right hand rule
What is the magnetic field due to a straight infinite current?
Magnetic field due to an infinitely long straight current carrying wire – definition.
B=(2πr)μ0I
where B is the magnitude of magnetic field, r is the distance from the wire where the magnetic field is calculated, and I is the applied current.
Is magnetic field infinite?
Researchers from the Complutense University of Madrid (UCM, Spain) have mathematically shown that
particles charged in a magnetic field can escape into infinity without ever stopping
. One of the conditions is that the field is generated by current loops situated on the same plane.
What does F BIL stand for?
-If the test charge has a velocity, the force is perpendicular to the plane formed. by vectors v and B in a direction given by the right-hand rule. F = BIL (f=
force
, b=magnetic field, i=current, l=length of conductor)
Which one decide the direction of magnetic lines of force due to a straight wire carrying current?
Rule : The direction of the magnetic lines of force is related with the direction of the current by
the right hand thumb rule
. The rule states : Curl the four fingers of the right hand on the palm, keeping the thumb stretched out at right angles. The thumb is straight and the fingers are circular.
Will the magnetic field be stronger in a straight wire?
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. Presented in the tutorial is a straight wire with a current flowing through it.
How can you increase the magnetic field strength of a straight wire?
- increasing the number of turns on the coil.
- increasing the current.
- placing an iron core inside the solenoid.
Where is the magnetic field due to a straight current wire is stronger or weaker?
In general, the magnetic field is
strongest close to the wire and weaker farther away
. In fact, the magnetic field weakens as where is the distance from the wire. This can change a bit depending on the length and shape of the wire.
Is ampère’s law valid for all closed paths?
Ampère’s law is
valid for all closed paths
, but it is not useful for calculating fields when the magnetic field produced lacks symmetry that can be exploited by a suitable choice of path.
Where is the magnetic field the strongest?
But we know the field inhabits all the space around the magnet. It is strongest at
the poles
. So, what are magnetic poles
