All Flashcards
Define magnetic force vector
The force exerted on a current-carrying wire or moving charge by a magnetic field; a vector quantity.
Define current in the context of magnetic forces on wires.
The rate of flow of electric charge through the wire, measured in Amperes (A).
Define length vector of a wire in a magnetic field.
A vector representing the length of the wire segment within the magnetic field; its direction is the same as the current.
Define magnetic field vector .
A vector field that describes the magnetic influence of electric currents and magnetic materials.
Define torque on a current loop.
A rotational force that causes the loop to rotate in a magnetic field.
Define permeability of free space .
A physical constant that relates the magnetic field to the electric current that produces it.
What is the effect of increasing the current in a wire placed in a magnetic field?
The magnetic force on the wire increases proportionally.
What happens when the angle between a current-carrying wire and a magnetic field is 0 degrees?
The magnetic force on the wire is zero.
What is the effect of placing a current-carrying loop in a magnetic field?
The loop experiences a torque, causing it to rotate (unless perfectly aligned with the field).
What happens when two parallel wires carry current in the same direction?
The wires attract each other.
What is the effect of increasing the distance from a long, straight current-carrying wire?
The magnetic field strength decreases.
What happens when a closed loop of wire is placed in a uniform magnetic field?
The net magnetic force on the loop is zero.
In the image of the wire loop, what do the variables represent in the equation for torque?
N: number of turns in the loop, I: current in the loop, A: area of the loop, B: magnetic field strength, θ: angle between the normal to the loop and the magnetic field.
In the image illustrating the Right-Hand Rule for wires, what do the thumb, fingers, and palm represent?
Thumb: Direction of the current (I), Fingers: Direction of the magnetic field (B), Palm: Direction of the force (F).