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Magnetism and Modern Physics flashcards
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- What is a magnetic field?Magnetic Fields
- A vector field influencing magnets and moving charges.
- What is a compass used for here?Magnetic Fields
- Indicating local magnetic-field direction.
- How do like magnetic poles interact?Magnetic Fields
- They repel.
- Do cut bar magnets isolate a single pole?Magnetic Fields
- No, each piece usually has both poles.
- When is magnetic force on a moving charge zero?Magnetic Fields
- When motion is parallel to the field, or speed is zero.
- What is a magnetic dipole?Magnetic Fields
- A magnetic structure with north and south behavior.
- What creates a magnetic field around a wire?Magnetic Fields
- Electric current.
- Does magnetic force directly do work on a point charge’s velocity?Magnetic Fields
- No; it is perpendicular to velocity in the ideal magnetic-force model.
- What is electromagnetic induction?Electromagnetism
- Induced emf from changing magnetic flux through a circuit.
- What is magnetic flux here?Electromagnetism
- A measure of magnetic field through a chosen surface.
- When can induced current flow?Electromagnetism
- When induced emf acts around a closed conducting path.
- What does Lenz’s law specify?Electromagnetism
- The induced effect opposes the change in flux.
- What produces induced emf?Electromagnetism
- Changing magnetic flux linkage.
- What does Lenz’s law state?Electromagnetism
- The induced response opposes the change in flux.
- What is magnetic flux?Electromagnetism
- The magnetic-field contribution through a surface.
- What is atomic number?Introductory Atomic and Nuclear Physics
- Number of protons.
- What is mass number?Introductory Atomic and Nuclear Physics
- Total number of protons and neutrons.
- What are isotopes?Introductory Atomic and Nuclear Physics
- Atoms with the same proton number but different neutron numbers.
- How many neutrons are in carbon-14?Introductory Atomic and Nuclear Physics
- Eight.
- What is a half-life?Introductory Atomic and Nuclear Physics
- The interval in which the expected undecayed population halves.
- What is nuclear fission?Introductory Atomic and Nuclear Physics
- Splitting a heavy nucleus into smaller nuclei.
- What is nuclear fusion?Introductory Atomic and Nuclear Physics
- Combining lighter nuclei.
- Can a nuclear change alter element identity?Introductory Atomic and Nuclear Physics
- Yes, when proton count changes.