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Apuntes Física 21 - Ejercicios Resueltos
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Ejercicios resueltos de Física 21, Cargas eléctricas y Leyes de Coulomb
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Física 21: Unidad de RepasoTema 3: Electrostática
Ejercicios Parte 1
−6 −8
1. Se tienen dos cargas eléctricas, q 1=5.10 coul y q 2=−4.10 coul , se
encuentran separadas en el vacío por una distancia de 5cm. Calcular el
modulo y las características de la fuerza con que se accionan.
Razonamiento
Lo primero a tener en cuenta es que para resolver este ejercicios es que ya
que se trata de un ejercicio de cargas eléctricas por lo cual debemos aplicar la
formula de Coulomb.
Lo segundo es que para aplicar la formula debemos operar en el sistema
M.K.S, así que tenemos que llevar nuestra distancia a dicho sistema. Así que
d=5 cm= ( 1005 ) m=5 . 10 −2
m
Desarrollo:
Tenemos que
−6
q 1=5.10 coul
−8
q 2=−4.10 coul
−2
d=5. 10 m
2
N .m
K=9.10 9 2
coul
Ahora para calcula la fuerza
q1 . q 2
F=K
d2
2 −6 −8
9 N . m 5.10 coul. 4.10 coul
F=9. 10 2
. −2 2
coul (5 .10 m)
2 −13 2
N . m 2.10 coul
F=9. 109 .
coul 2 2,5. 10−3 m2
N . m2 −11 coul
2
F=9. 109 .8. 10
coul 2 m2
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