D.2 Electric and magnetic fieldsIB Physics SL: Flashcards

Card 1 of 130 of 13 known

Question

What forces act between like and unlike charges?

Tap or press Space to reveal

Tap card or press Space to flip

See all 13 cards

What forces act between like and unlike charges?: Like charges repel; unlike charges attract.
State Coulomb's law.: F = kq₁q₂/r², with k = 1/(4πε₀) = 8.99 × 10⁹ N m² C⁻².
State the law of conservation of charge.: The total charge of an isolated system stays constant.
What did Millikan's experiment show?: Charge is quantised: always a whole-number multiple of e = 1.6 × 10⁻¹⁹ C.
Balance condition for a stationary oil drop?: qE = mg, with E = V/d.
How does rubbing charge an insulator?: Electrons are transferred from one material to the other.
Final sign of a conductor charged by induction?: Opposite to the charge on the inducing rod.
What is the role of earthing in charging by induction?: It lets electrons flow between the conductor and earth; it is removed before the rod.
Define electric field strength.: Force per unit charge on a small positive test charge: E = F/q.
Field strength between parallel plates?: E = V/d, uniform in the central region.
What does field line density show?: Field strength: closer lines, stronger field.
How do magnetic field lines differ from electric field lines?: Magnetic lines form closed loops; electric lines start and end on charges.
Field pattern of a long straight current-carrying wire?: Concentric circles centred on the wire.