Physics unit 4 3.0 / 5 based on 1 rating ? PhysicsA2/A-levelOCR Created by: lauraCreated on: 22-05-13 11:56 Electric field strength Force per unit positive charge 1 of 15 Potential gradient =Electric field strength=V/D 2 of 15 Magnetic flux density Force per unit Current x Length x Sin(theta) 3 of 15 Tesla One tesla is the magnetic flux density when a wire of 1 metre has a current of 1 amp perpendicular to the field 4 of 15 Magnetic Flux product of magnetic flux density and area at right angles to the flux 5 of 15 Faraday's law the magnitude of the induced e.m.f is equal to the rate of magnetic flux 6 of 15 Lenz's law the direction of any induced current is in a direction that opposes the flux change that causes it 7 of 15 Nucleon nuclear particle, either a proton or a neutron 8 of 15 Activity the rate at which a source emits radioactive particles 9 of 15 Half-life time taken for a radioactive sources activity to decrease by half 10 of 15 Binding energy energy required to seperate an atom into it's constituent parts 11 of 15 Intensity Power per unit cross-sectional area 12 of 15 Acoustic Impedance Z=pc 13 of 15 Hubble's law the speed of recession of a galaxy is directly proportional to its distance from the earth 14 of 15 Cosmological principle the universe is isotropic and homogeneuos 15 of 15
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