OCR H556 A-LEVEL PHYSICS
Study
Electric Field
A region around a body in which another charged body feels a force
Electric Field Strength
(NC^-1) The force per unit positive charge
Magnetic Flux
(Wb) The product of the MFD and the Area
Magnetic Flux Density
(T) The force per unit length on a conductor carrying a unit current at that point
Tesla
Measure of MF per area squared
Weber
Measure of MF when the magnetic field of MFD is 1m^2
Magnetic Flux Linkage
(weber-turns) The product of the Magnetic Flux and the number of turns.
Capacitance
(F) Charge per unit potential difference. Ratio.
Farad
Coulomb per volt
Time constant of a capacitor-resistor circuit
τ = CR, x=x0e^-t/CR
Time for the charge to have decreased by 1/e
Isotope
Elements with the same proton number but different mass numbers
Activity- Radioactivity
(Bq) The number of nuclear decays per unit time
Decay constant
(s^-1) The probability that an individual nucleus will decay per unit time
Half Life
(t1/2) The time taken for the number of undecayed nuclei to halve
Binding Energy
(J) The minimum energy needed to separate all the nucleons in a nucleus. Equal to the
mass defect
Binding Energy per Nucleon
The binding energy divided by the total number of nucleons
Intensity
(Wm^-2) Power per unit area
Critical Density
The density of the universe for it to reach a final, finite size
Faraday's Law
emf ∝ rate of change of magnetic flux
Coulomb's Law
The electrical force between two point charges is directly proportional to predict of their
charges and inversely proportional to the square of their separation
emf
Study
Electric Field
A region around a body in which another charged body feels a force
Electric Field Strength
(NC^-1) The force per unit positive charge
Magnetic Flux
(Wb) The product of the MFD and the Area
Magnetic Flux Density
(T) The force per unit length on a conductor carrying a unit current at that point
Tesla
Measure of MF per area squared
Weber
Measure of MF when the magnetic field of MFD is 1m^2
Magnetic Flux Linkage
(weber-turns) The product of the Magnetic Flux and the number of turns.
Capacitance
(F) Charge per unit potential difference. Ratio.
Farad
Coulomb per volt
Time constant of a capacitor-resistor circuit
τ = CR, x=x0e^-t/CR
Time for the charge to have decreased by 1/e
Isotope
Elements with the same proton number but different mass numbers
Activity- Radioactivity
(Bq) The number of nuclear decays per unit time
Decay constant
(s^-1) The probability that an individual nucleus will decay per unit time
Half Life
(t1/2) The time taken for the number of undecayed nuclei to halve
Binding Energy
(J) The minimum energy needed to separate all the nucleons in a nucleus. Equal to the
mass defect
Binding Energy per Nucleon
The binding energy divided by the total number of nucleons
Intensity
(Wm^-2) Power per unit area
Critical Density
The density of the universe for it to reach a final, finite size
Faraday's Law
emf ∝ rate of change of magnetic flux
Coulomb's Law
The electrical force between two point charges is directly proportional to predict of their
charges and inversely proportional to the square of their separation
emf
