Is magnetic field constant along a field line?
A magnetic field has no sources or sinks (Gauss’s law for magnetism), so its field lines have no start or end: they can only form closed loops, extend to infinity in both directions, or continue indefinitely without ever crossing itself.
Is the magnetic field vector b constant?
The B field is usually not constant along a line of flux.
How does the magnitude of a magnetic field vary with distance?
The strength of the magnetic field decreases with distance from the wire. (For an infinite length wire the strength is inversely proportional to the distance.)
How do you find the magnitude of B field?
Magnetic Force
- The force is perpendicular to both the velocity v of the charge q and the magnetic field B.
- The magnitude of the force is F = qvB sinθ where θ is the angle < 180 degrees between the velocity and the magnetic field.
- The direction of the force is given by the right hand rule.
What is B 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. …
What is magnetic field and field lines?
The magnetic field is an abstract entity that describes the influence of magnetic forces in a region. Magnetic field lines are a visual tool used to represent magnetic fields. They describe the direction of the magnetic force on a north monopole at any given position.
Why is magnetic field B?
Most textbooks on electricity and magnetism distinguish the magnetic field H and the magnetic induction B. Yet, in practice physicists and chemists almost always call B the magnetic field, which is because the term “induction” suggests an induced magnetic moment.
How do you find the magnitude of a magnetic field?
The magnitude of the force on a wire carrying current I with length L in a magnetic field is given by the equation. F=ILBsinθ where θ is the angle between the wire and the magnetic field. The force is perpendicular to the field and the current.
What is the relation between magnetic field B current I and distance r in case of a straight current carrying conductor?
B∝I/r.
What is the magnitude B of the magnetic field?
Equation : B=2πRμ0i gives the magnitude B of the magnetic field set up by a current in an infinitely long straight wire, at a point P at perpendicular distance R from the wire.
Why is magnetic field as B?
Why is magnetic field B field?
Ever wondered why magnetic fields are called B? The origin of B was James Clerk Maxwell himself! In his text, “A Treatise on Electricity and Magnetism”, Maxwell presents a list of the vector quantities he will be dealing with. He then labels them in alphabetical order!
What determines the direction of positive L in a magnetic field?
The direction of (conventional) current defines the direction of positive L. This relationship will be examined two ways. First, a constant current will be selected, and wires of various lengths will be placed perpendicular to a magnetic field (θ = 90°). The force magnitude will be measured.
Why is it difficult to measure the force of a magnetic field?
There are two problems with this. First its difficult to measure a force on a rigid wire (there will be current leads and other stuff hanging on it which confuses matters). Secondly the leads connected to the sample wire might also experience part of the magnetic field and this produces forces which may confuse matters.
What is the formula for the magnetic field of a wire?
F= IL×B or F= ILB sinθ depends on the current through the wire, I, the length of wire in the magnetic field, L, the magnitude of the magnetic field, B, and, since Land Bare vectors, the angle θbetween the length of wire and the field.
Do two wires exert force on each other in a magnetic field?
In addition, when placed in a magnetic field, a wire carrying a current will experience a net force. Thus, we expect two current-carrying wires to exert force on each other. Consider two parallel wires separated by a distance a and carrying currents I1 and I2 in the +x-direction, as shown in Figure 9.2.1.