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Het instituut voor Eindexamentraining in de exacte vakken




        VWO natuurkunde 2013

           Meer info op www.ivet.nl



1                      Elektromagnetisme
Elektromagnetisme
Elektrisch veld
       Kracht op puntlading in een
        elektrisch veld
        –   Fel = q•E                                    U=10 V
        –   eenheid van elektrische veldsterkte E is               ?
            V/m
       Veldsterkte in homogeen veld overal                   e-
        constant                        +                              -
        –   Wat gebeurt er als ik een negatieve
            puntlading loslaat bij de negatieve plaat?
        –   en met welke snelheid raakt deze de
            positieve plaat?en met welke snelheid
            raakt deze de positieve plaat?               Δx=1 cm

3                            Elektromagnetisme
Elektrisch veld
       Kracht op puntlading in een
        elektrisch veld
        –   Fel = q•E
                                                         U=10 V
        –   eenheid van elektrische veldsterkte E is
            V/m
       Veldsterkte in homogeen veld overal                   e-
        constant                        +                          -
        –   Wat gebeurt er als ik een negatieve
            puntlading loslaat bij de negatieve plaat?
        –   en met welke snelheid raakt deze de
            positieve plaat?
        –   ∆Ek = q•U
4                            Elektromagnetisme
Magnetisch veld
       opgewekt door
         –   staafmagneet
         –   stroomvoerende spoel
       sterkte magneetveld in
        stroomvoerende spoel
        B = μ0•N•I/L
       richting wordt bepaald door
        rechterhandregel

       rechterhandregel ook toepasbaar
        op stroomvoerende draad


5                            Elektromagnetisme
Lorentzkracht
       Kracht op stroomvoerende draad in
        een uitwendig magnetisch veld                    I
       FL=B•I•L (alleen als B loodrecht op I
        staat)
         –   [B] = N/(A m) = T (tesla)
       kracht op geladen deeltjes                  FL
         FL=B•q•v
                                                             B
       Richting van de Lorentzkracht:
        linkerhandregel


6                               Elektromagnetisme

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VWO Natuurkunde 2013

  • 1. Het instituut voor Eindexamentraining in de exacte vakken VWO natuurkunde 2013 Meer info op www.ivet.nl 1 Elektromagnetisme
  • 3. Elektrisch veld  Kracht op puntlading in een elektrisch veld – Fel = q•E U=10 V – eenheid van elektrische veldsterkte E is ? V/m  Veldsterkte in homogeen veld overal e- constant + - – Wat gebeurt er als ik een negatieve puntlading loslaat bij de negatieve plaat? – en met welke snelheid raakt deze de positieve plaat?en met welke snelheid raakt deze de positieve plaat? Δx=1 cm 3 Elektromagnetisme
  • 4. Elektrisch veld  Kracht op puntlading in een elektrisch veld – Fel = q•E U=10 V – eenheid van elektrische veldsterkte E is V/m  Veldsterkte in homogeen veld overal e- constant + - – Wat gebeurt er als ik een negatieve puntlading loslaat bij de negatieve plaat? – en met welke snelheid raakt deze de positieve plaat? – ∆Ek = q•U 4 Elektromagnetisme
  • 5. Magnetisch veld  opgewekt door – staafmagneet – stroomvoerende spoel  sterkte magneetveld in stroomvoerende spoel B = μ0•N•I/L  richting wordt bepaald door rechterhandregel  rechterhandregel ook toepasbaar op stroomvoerende draad 5 Elektromagnetisme
  • 6. Lorentzkracht  Kracht op stroomvoerende draad in een uitwendig magnetisch veld I  FL=B•I•L (alleen als B loodrecht op I staat) – [B] = N/(A m) = T (tesla)  kracht op geladen deeltjes FL FL=B•q•v B  Richting van de Lorentzkracht: linkerhandregel 6 Elektromagnetisme