D.2 Electric and magnetic fieldsIB Physics HL: Flashcards

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State Coulomb's law.

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State Coulomb's law.: F = kq₁q₂/r², with k = 1/(4πε₀).
What did Millikan's experiment show?: Charge is quantised in units of e = 1.60 × 10⁻¹⁹ C.
Final charge on a conductor charged by induction?: Opposite in sign to the inducing charge.
Define electric field strength.: Force per unit charge on a small positive test charge: E = F/q.
Field between parallel plates?: Uniform, E = V/d.
Define electric potential energy of a system.: Work done to assemble the system from infinite separation.
Ep for two point charges?: Ep = kq₁q₂/r; positive for like charges, negative for unlike.
Define electric potential.: Work done per unit charge bringing a positive test charge from infinity: V = kQ/r.
Where is electric potential zero?: At infinity, by definition.
Is potential a vector or scalar?: Scalar; potentials from several charges add directly.
How are E and V related?: E = −ΔV/Δr, the negative potential gradient.
Work done moving charge q through a potential difference?: W = qΔV, independent of path.
How are equipotentials related to field lines?: They are perpendicular to each other.
Equipotentials between parallel plates?: Planes parallel to the plates, equally spaced for equal steps of V.