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phys documents (dragged) 19

# phys documents (dragged) 19 - 12 Physics Formulary by ir...

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12 Physics Formulary by ir. J.C.A. Wevers If the flux enclosed by a conductor changes this results in an induced voltage V ind = - N d Φ dt . If the current flowing through a conductor changes, this results in a self-inductance which opposes the original change: V selfind = - L dI dt . If a conductor encloses a flux Φ holds: Φ = LI . The magnetic induction within a coil is approximated by: B = μNI l 2 + 4 R 2 where l is the length, R the radius and N the number of coils. The energy contained within a coil is given by W = 1 2 LI 2 and L = μN 2 A/l . The capacity is defined by: C = Q/V . For a capacitor holds: C = ε 0 ε r A/d where d is the distance between the plates and A the surface of one plate. The electric field strength between the plates is E = σ / ε 0 = Q/ ε 0 A where σ is the surface charge. The accumulated energy is given by W = 1 2 CV 2 . The current through a capacity is given by I = - C dV dt . For most PTC resistors holds approximately: R = R 0 (1 + α T ) , where R 0 = ρ l/A . For a NTC holds: R ( T ) = C exp( - B/T ) where B and C depend only on the material.
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