ATIVIDADE DE FÍSICA – 3° ANO_JUNHO_2012
Autor: DAMYAOONLINE | Publicado: 2012-06-26T10:32:00-07:00

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COLÉGIO ESTADUAL FRANCISCA PEREIRA DE SOUSA MORAIS

DISCIPLINAS: Física&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
SÉRIE: 3º ano&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ano:&nbsp; 2012

PROFESSOR: Damião Batista de Sá

Aluno(a) __________________________________________ n° ______

Aluno(a) __________________________________________ n° ______

Aluno(a) __________________________________________ n° ______

Aluno(a) __________________________________________ n° ______



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ATIVIDADE DE FÍSICA – 3°
ANO_JUNHO_2012



ENERGIA POTENCIAL ELÉTRICA



"Energia potencial corresponde
a capacidade da força elétrica realizar trabalho."



&nbsp;A energia potencial é uma grandeza escalar.

&nbsp; No SI, a energia é medida em Joule ( J ).



1.&nbsp; No campo elétrico produzido
por uma carga pontual Q = 3.10-2 C, qual é a energia potencial
elétrica de uma carga q = 3.10-7 C, colocada a 12.10-2 m
de Q? Considere as cargas no vácuo.



2.&nbsp; No campo produzido por uma
carga pontual Q = 5.10-3 C, qual é a energia potencial elétrica de
uma carga q = - 4.10-8 C, situada a 9.10-2 m de Q?
Considere as cargas no vácuo.



3. Do ponto de vista
energético, qual a semelhança entre dois blocos unidos por uma mola, comprimida
entre eles, e dois objetos próximos, eletrizados com cargas de mesmo sinal?



4. Quando uma carga elétrica se
aproxima de outra de sinal contrário, a sua energia potencial elétrica aumenta
ou diminui?





POTENCIAL ELÉTRICO



"Com relação a um campo
elétrico, interessa-nos a capacidade de realizar trabalho, associada ao campo
em si, independentemente do valor da carga q colocada num ponto P desse
campo."



O potencial elétrico, V, é
uma grandeza escalar.

No SI, o potencial&nbsp; é medido em volt (V)





1.&nbsp; A energia potencial elétrica
de uma carga q, situada no ponto P de um campo elétrico, vale 40 J. Calcule o
potencial elétrico no ponto P, quando q = 5. 10-6C .



2.&nbsp; A energia potencial elétrica
de uma carga q, situada no ponto P de um campo elétrico vale -20 J. Calcule o
potencial elétrico no ponto P, quando q = 0,05 C.



3.&nbsp; Uma carga Q tem um potencial
de 12 V em um ponto P. Qual é a energia potencial elétrica de uma carga q = 5. 10-6C,
colocada no ponto P?



4.&nbsp; No campo elétrico produzido
por uma carga pontual Q = 4.10-7 C, calcule o potencial elétrico em
um ponto P, situado a 2m de Q. O meio é o vácuo.