G485keywords 2.0 / 5 PhysicsA2/A-levelOCR Created by: Timothy JacksonCreated on: 26-04-13 20:18 electric field strength force per unit positive charge 1 of 24 magnetic flux density flux density perpendicular to a wire = magnetic force on a wire/(length of wire × current flowing through wire) 2 of 24 tesla 1 tesla = the flux density that causes a force of one newton on a wire of length one meter carrying a current of one amp 3 of 24 magnetic flux magnetic flux = magnetic flux density × cross sectional area perpendicular to magnetic field 4 of 24 weber 1 weber = the flux due to a flux density of one tesla passing through an area of one m^2 5 of 24 magnetic flux linkage flux linkage to a coil = flux passing through one turn × number of turns 6 of 24 Faraday's law of electromagnetic induction induced E.M.F. is proportional to the rate of change of magnetic flux 7 of 24 capacitance charge per unit potential difference 8 of 24 farad coulomb per volt 9 of 24 time constant time for the charge to fall by a factor of e 10 of 24 proton number number of protons in a nucleus 11 of 24 isotopes nuclei with the same proton number but different nucleon numbers 12 of 24 activity number of decays per unit time 13 of 24 decay constant the probability of decay of a nucleus per unit time 14 of 24 half life the time for the activity of a sample to half 15 of 24 binding energy minimum energy to separate all nucleons of a nucleus 16 of 24 binding energy per nucleon minimum energy to separate all nucleons of a nucleus divided by the number of nucleons in the nucleus 17 of 24 Hubble's law the speed of recession of a galaxy is proportional to its distance from the observer 18 of 24 the cosmological principle on a large scale the universe is uniform (isotropic and homogeneous) 19 of 24 critical density the density for which the rate of expansion of the universe tends to zero 20 of 24 AU mean distance between the earth and sun 21 of 24 parsec distance from a base length of AU that subtends an angle of 1 arcsecond 22 of 24 light-year the distance traveled at the speed of light in one year 23 of 24 intensity power per unit cross-sectional area 24 of 24

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