All Flashcards
What is the effect of increasing the current in a wire on the magnetic field around it?
Increasing the current increases the strength of the magnetic field around the wire.
What happens when a current-carrying loop is placed in a uniform magnetic field?
The loop experiences a torque that causes it to rotate, aligning its magnetic moment with the external field.
What is the effect of orienting a current-carrying wire parallel to a magnetic field?
The magnetic force on the wire is zero.
What is the effect of orienting a current-carrying wire perpendicular to a magnetic field?
The magnetic force on the wire is maximum.
What happens when two parallel wires carry current in the same direction?
The wires attract each other.
What happens when two parallel wires carry current in opposite directions?
The wires repel each other.
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 are the steps to determine the direction of the force on a current-carrying wire using the Right-Hand Rule (RHR)?
- Point your thumb in the direction of the current (I). 2. Point your fingers in the direction of the magnetic field (B). 3. Your palm will point in the direction of the force (F).
What are the steps to determine the direction of the magnetic field around a current-carrying wire using the Right-Hand Curl Rule (RHCR)?
- Point your thumb in the direction of the current (I). 2. Curl your fingers; they will curl in the direction of the magnetic field (B).
Outline the process to determine the force between two parallel current-carrying wires.
- Use RHCR to find the magnetic field created by wire 1 at the location of wire 2. 2. Use RHR to find the force on wire 2 due to the magnetic field from wire 1. 3. Determine if the force is attractive (parallel currents) or repulsive (anti-parallel currents).
Describe the steps to calculate the torque on a current loop in a magnetic field.
- Determine the area (A) of the loop. 2. Find the angle () between the normal to the loop and the magnetic field. 3. Calculate the torque using the formula .
What is the process for solving a problem involving a wire with both straight and curved sections in a magnetic field?
- For straight sections, use and the RHR. 2. For curved sections, consider symmetry to simplify. 3. Integrate or sum the forces on small segments if necessary.