Questions and Answers
The electric field lines originate on negative charges and terminate on positive charges.
False
Magnetic field lines begin and end at specific points.
False
Magnetic charges (magnetic monopoles) are known to exist.
False
Coulomb's law describes the force between magnetic charges.
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Ampère believed that magnetic effects are caused by magnetic charges.
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Study Notes
Electric and Magnetic Fields
- Electric field lines diverge away from a positive charge and terminate on negative charges.
- Magnetic field lines curl around a current, forming closed loops or extending out to infinity.
- Magnetic field lines have no beginning or end, as they do not originate from a point source like electric charges.
Magnetic Monopoles
- The concept of magnetic charges, or magnetic monopoles, was once believed to be responsible for magnetism.
- Coulomb's law was thought to have a magnetic version, describing the force between magnetic monopoles.
- However, Ampère later proposed that all magnetic effects are due to electric charges in motion, or currents.
Key Properties of Magnetic Fields
- Magnetic fields have zero divergence, represented by the equation ∇ · B = 0.
- This means that magnetic fields do not originate from a single point, unlike electric fields.
