Magnetism and Matter

• F= BIL= MG
• Time period of revolution of a charged particle id directly proportional to mass and inversely proportional to charge of particle
• F= q[E + v*B]
• To increase the range of ammeter shunt resistance is connected in parallel to the ammeter.

  (needed I - given I) R = Given I * Ammeter R
• 1/2mv^2 = q V=K.E
• Total Magnetic flux 


  (B ext + B c)A cosx
• To convert galvanometer to ammeter small resistance in parallel is connected.

  S= IgG/I-Ig
• Ig for galvanometer to voltmeter= V/Rg + R
• Magnetic field, B is inversely proportional to cube of distance
• From curie law,

  Magnetic susceptibility, X is inversly proportional to temperature
• Ferromagnetic materials have high permeability and retentivity.
• Two characterstics of material for making permanent magnets (iron, nickel, cobalt, neodymium) are: high coercivity , high remanence and high retentivity
• Needle in uniform M.F. experience torque but not force
• Needle in non uniform M.F. experence torque and force both
• Magnetic moment of current carrying loop is directly proportional to area of loop