Mumbai university > FE > SEM 1 > Applied Physics 1

Marks: 3M

Year: May 2014

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship.

$ B = μH$

$ = μ_o μ_r H$

$μ_o – permeability \ \ of \ \ free \ \ space$

$μ_ r – relative \ \ permeability \ \ of \ \ material$

$ = μ_o μ_r\frac{NI}{l}$

$\phi = B × A$

$\phi = μ_o μ_r \frac{NIA}{l}$

$ =\frac{MMF}{reluc \ \ tan \ \ ce}$

MMF - Magnetive motive force

Hence this equation resembles $ I = \frac{V}{R} = \frac{emf}{resis \ \ tan \ \ ce}$