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Comparison between gravitational, electric and magnetic field Gravitational Electric Magnetic Mass m Charge q Current element I l F G mM r2 F qQ 4 o r 2 Gravitational field Gravitational field strength Gravitational field intensity Gravitational flux density GM g 2 r Electric field Electric field strength Electric field intensity Electric flux density Q E 4 o r 2 g Area g A E Area E A Unit of g is Nkg-1 or ms-2 Unit of E is NC-1 or Vm-1 F IBl Magnetic field Magnetic field strength Magnetic field intensity Magnetic flux density Magnetic induction F B Il Gravitational field strength Electrical field strength is Magnetic field strength is is the gravitational force per the electrical force per unit the magnetic force per unit unit mass. charge. test current element. Gravitational flux Magnetic flux Electric flux Gravitational flux = number Electric flux = number of Magnetic flux = number of of gravitational lines of electric lines of force/flux ______________ lines of force cross the area __________ cross the area across the area Area A Unit of is Wb Unit of B is T or Wbm-2 B : Magnetic flux density : magnetic flux Book 2 p.9 Book 2 p.33 Book 2 p. Other Relevant Equation Other Relevant Equation Other Relevant Equation dV 1. E dr 2. V Edr