# Shared Flashcard Set

## Details

G485: Fields, particles and frontiers of Physics
Keywords for this examination module.
18
Physics
05/12/2010

Term
 Electric field
Definition
 An electric field is created by electric cahrges. It is region where other electric charges will feel a force.
Term
 Electric field strength
Definition
 The force per unit charge at a point in an electric field. The units are NC-1 or Vm-1.
Term
 Coulomb's law
Definition
 Two electric charges exert an electrical force on each other that is proportional to the product of their own electric charge and inversely proportional to their separation squared.
Term
 Magnetic field
Definition
 A magnetic field is created by moving electric charges. Moving charges in a magnetic field will feel a force.
Term
 Magnetic flux
Definition
 MAgnetic flux is the magnetic field lines.
Term
 Magnetic flux density
Definition
 The density of the magnetic field lines at a point in the magnetic field. As a consequence it actually describes the strength of the magnetic field at that point. The unit for magnetic flux density is the the Tesla (T)
Term
 Lenz's law
Definition
 An induced current or e.m.f. is in a direction so as to produce effects which opposes the change that is producing it. For example the e.m.f. induced in a generators coil will cause a force to oppose the movement of the coil because of the interaction between its own magnetic field and the one that it is in.
Term
 Capacitance
Definition
 Capacitiance is the amount of electric charge stored if there is a potential difference of 1 volt across the capacitor. It is measured in Farads (F)
Term
 Time constant
Definition
 The time constant which is equal to RC and is measured in seconds is the time it takes for the current/quantity of charge/ potential difference to fall to 1/e or 37% of its inital value.
Term
 Mass or nucleon number
Definition
 Number of nucleons (protons or neutrons) inside the nucleus of an atom.
Term
 Atomic or proton number
Definition
 The number of protons in the nucleus of an atom
Term
 Isotope
Definition
 Atoms which have the same number of protons (hence they belong to the same element) but different numbers of neutrons.
Term
 Strong nuclear force
Definition
 A very strong force but with an incredibly small range between the nucleons in an atoms nucleus. This force balances the electrostatic repulsion between the protons.
Term
Definition
 A particel which is made up of two or three quarks. These particles are affected by the strong force.
Term
 Leptons
Definition
 These particles like the electron are considered to be fundamental (cannot be broken down anymore). Therefore they do not consist of quarks and are not affected by the strong nuclear force.
Term
 Baryon
Definition
 The proton or neutron are examples of baryons. They consist of three quarks.
Term
 Meson
Definition
 A hadron which consists of two quarks
Term
 Quark
Definition
 A fundamental particle. These particles have several properties - Baryon number(B), charge (Q), strangeness (S) and Charm, Bottomness and Topness(the last three are not required for conservation analysis)
Supporting users have an ad free experience!