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From engineering viewpoint, magnetic field strength $H$ can be thought of as excitation, and the magnetic flux density $B$ as the response of the magnetised medium.
Expertise. Physics. Magnetic Flux Density Definition. The magnetic flux density B is defined as: The force acting per unit current per unit length on a current-carrying conductor placed perpendicular to the magnetic field. Rearranging the equation for magnetic force on a wire, the magnetic flux density is defined by the equation:
The overall aim of this experiment is to calculate the magnetic flux density of a magnet. This is done by measuring the force on a current-carrying wire placed perpendicular to the field. This is just one example of how this required practical might be carried out.
The formula for the magnetic force is: F = B I L sin θ. F=BIL\sin\theta F = BI Lsinθ. Where F is the force, B is the magnetic field strength, L is the length of wire in the field and θ is the angle between the field lines and the wire.
Rearranging the equation for magnetic force on a wire, the magnetic flux density is defined by the equation: Where: B = magnetic flux density (T) F = magnetic force on a current-carrying wire (N) I = current (A) L = length of the wire (m) For reference, the Earth's magnetic flux density is around 0.032 mT and an ordinary fridge magnet is around ...
Magnetic flux density (\({\bf B}\), T or Wb/m\(^2\)) is a description of the magnetic field that can be defined as the solution to Equation \ref{m0005_eFqvB}. Figure \(\PageIndex{4}\): The magnetic field of a bar magnet, illustrating field lines.
The induced current produces magnetic fields which tend to oppose the change in magnetic flux that induces such currents. To illustrate how Lenz’s law works, let’s consider a conducting loop placed in a magnetic field. We follow the procedure below: 1. Define a positive direction for the area vectorA. G 2.
