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FUERZA MAGNÉTICA SOBRE UNA CORRIENTE ELÉCTRICA
Primeramente equilibramos la balanza con la espira en circuito, abierto (I=0) y anotamos el valor de la masa necesaria M0=41,2 g.
Procedemos a conectar la espira a la fuente de alimentación y mediante el reostato fijamos unos valores de intensidad y equilibramos la balanza para cada valor de la intensidad:
I(A.) M 1 (g.)
1 42
1,5 42,4
2 42,8
2,5 43,2
3 43,6
Calculamos ahora la fuerza magnética a partir de los valores de M1 y del valor de M0; sabiendo que Fm=(M 1 -M 0 )g.
I(A.) Fm(N.)
1 --> 42 - 41,2 = 0,8g. = 0,008 Kg."10 = 0,008
1,5 --> 42,1 - 41,2 = 1,2g. = 0,0012 Kg."10 = 0,012
2 --> 42,8 - 41,2 = 1,6g. = 0,0016 Kg."10 = 0,016
2,5 --> 43,2 - 41,2 = 2g. = 0,002 Kg."10 = 0,02
3 --> 43,6 - 41,2 = 2,4g. = 0,0024 Kg."10 = 0,024
A continuación representamos la gráfica Fm. frente a I., y calculamos a partir del método de los mínimos cuadrados el coeficiente angular de la recta, «m» . Para ello tomamos los puntos 1-4 y 2-5; cálculo la pendiente de la recta formada por esos pares de puntos y hallamos la media.
1
2
3
4
El error cometido es 0 ya que las medidas son exactas y corresponden totalmente con el valor esperado teóricamente como se puede observar en la gráfica.
El coeficiente angular «m» corresponde a N l B; de donde puedo obtener el valor del campo (B), ya que l es la longitud de la espira (0,015 m.), N el número de espiras (2) y m el coeficiente angular que acabamos de calcular.
5
FUERZA MAGNÉTICA SOBRE UNA CORRIENTE ELÉCTRICA
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Enviado por: David García Fernández Idioma: castellanoPaís: España