All Flashcards
Compare and contrast the Right-Hand Rule (RHR) and Right-Hand Curl Rule (RHCR).
RHR: Thumb = velocity, fingers = B field, palm = force (on moving charge). RHCR: Thumb = current, fingers = B field (around a wire).
Define magnetic domains.
Regions within a material where atomic magnetic moments are aligned, creating a small area of uniform magnetization.
What are magnetic field lines?
Visual representations of a magnetic field, indicating the direction a north pole would move; density indicates field strength.
Define magnetic dipole.
A pair of equal and opposite magnetic poles separated by a distance, behaving like tiny magnets.
What is the SI unit for magnetic field strength (B)?
Tesla (T). 1 T = Ns/Cm
Define electromagnet.
A wire carrying an electric current that produces a magnetic field around it.
What is ?
Permeability of free space, a constant that relates the magnetic field to the current producing it.
Describe the steps to determine the direction of magnetic force on a moving positive charge.
- Point thumb in the direction of the positive charge's velocity. 2. Point fingers in the direction of the magnetic field. 3. Palm indicates the direction of the magnetic force.
How do you determine the direction of the magnetic field around a current-carrying wire?
Use the Right-Hand Curl Rule (RHCR): Point thumb in the direction of the current; fingers curl in the direction of the magnetic field.