# ^Commonly used results in electricity & magnetism

^Commonly used results in electricity & magnetism

 Electricity Magnetism Source of field Static or moving charges Moving charges SI units Charge: coulomb (C)Electric field: Newton /coulomb (N/C) Magnetic pole: ampere meter (Am).Magnetic field is tesla (T) Field lines Discontinuous: Start at a + ve charge & end at equal -ve charge. Continuous: Have no start or end & are closed loops. Field due to a mono pole Proportionality constant (SI units) ke = 1 in cgs units in SI unitskm = 1 in cgs units Force on a monopole Potential due to a mono pole Coulomb’s law of two point poles Screening or shielding Using hollow metallic boxes. Using ferromagnetic boxes. Gauss’s law Force exerted by field on charge particles Trajectories of charged particles in field In electric field: 1.  Straight line if the angle between electric field & velocity of the charges particle is 00 or 1800 & 2.  parabolic if the angle between electric field & velocity of the charges particle is other than 00 & 1800. In magnetic field: 1.    Straight line if the angle between magnetic field & velocity of the charges particle is 00 or 1800, 2.    circular if the angle between magnetic field & velocity of the charges particle is 900. 3.    helical if the angle between magnetic field & velocity of the charges particle is other than 00, 900 & 1800. Dipole moment of a dipole of length 2 L Field on axial line of a dipole Field on equatorial of a dipole Field at any point of short dipole Potential on the axial line of dipole Potential at any point of short dipole Force on a dipole placed in a region of uniform field Force on each pole = qE Net force on dipole = 0 Force on each pole = mB Net force on dipole = 0 Force on a dipole placed in a non uniform field Torque acting on dipole placed in a region of uniform field Condition for equilibrium of dipole placed in a region of uniform field Potential energy of dipole – field system placed in a region of uniform field
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