https://phet.colorado.edu/sims/html/charges-and-fields/latest/charges-and-fields_nl.html
https://phet.colorado.edu/sims/cheerpj/faraday/latest/faraday.html?simulation=magnets-and-electromagnets&locale=nl
https://phet.colorado.edu/sims/cheerpj/faraday/latest/faraday.html?simulation=faraday
https://www.youtube.com/watch?v=yJyVTd_O-vw LET OP! GELUID UIT
https://www.youtube.com/watch?v=aMH7pdn-qr4&feature=emb_rel_end LET OP! GELUID UIT