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Cargas y campos: Coulomb y cargas puntuales

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Cargas y campos: Coulomb y cargas puntuales

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Quiz sobre carga, ley de Coulomb y campo eléctrico

Created by

martin vazquez
martin vazquez
Uruguay

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Cargas y campos: Coulomb y cargas puntuales
 

Cargas y campos: Coulomb y cargas puntualesOnline version

Quiz sobre carga, ley de Coulomb y campo eléctrico

by martin vazquez
1

¿Qué mide la ley de Coulomb entre cargas puntuales?

2

¿Qué representa la constante k en la ley de Coulomb?

3

Si dos cargas puntuales iguales se acercan, ¿qué pasa con la fuerza entre ellas?

4

¿Qué es una carga puntual?

5

¿Qué es el campo eléctrico?

6

La dirección de la fuerza sobre una carga positiva en un campo E es:

7

Si duplicas la carga q en F = qE, ¿qué pasa con la fuerza?

8

Unidad del campo eléctrico (E) es:

9

¿Qué ley relaciona magnitud de F con cargas y distancia?

10

Si la distancia entre dos cargas se triplica, ¿cómo cambia la fuerza entre ellas?

Explicación

La ley de Coulomb describe la fuerza entre dos cargas puntuales en función de su magnitud y distancia.

k = 1/(4πε0) y depende del medio, mide la intensidad de la interacción entre cargas.

La fuerza F ∝ 1/r^2, así que al reducirse r, F aumenta.

Una carga puntual se modela como si su tamaño fuera un punto infinitesimal.

Un campo eléctrico describe la fuerza por unidad de carga en cada punto.

La fuerza F = qE, con q>0, apunta en la dirección de E.

F es directamente proporcional a q, manteniendo E constante.

El campo se mide en Newtons por Coulomb.

La Ley de Coulomb expresa F ∝ (k q1 q2)/r^2.

F ∝ 1/r^2; si r→3r, F→(1/9) de F inicial.

 
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