Lista 1 - 1ºBimestre 3º ANO
Autor: Wesley Boracchi  | Publicado: 2013-03-13T19:58:00-07:00



Nomes__________________________________nos:________3ª_______


1ª Lista de Física – Eletricidade 


Eletrostática


<!--[if !supportLists]-->1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->O
que é carga elétrica? &nbsp;Todas as
partículas na Natureza possuem carga elétrica? 


<!--[if !supportLists]-->2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Descreva
o tipo de carga elétrica que possui o próton e o elétron. Eles se atraem ou se
repelem? Justifique.


<!--[if !supportLists]-->3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Descreva
com suas palavras o que diz a Lei de Coulomb.


<!--[if !supportLists]-->4)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <!--[endif]-->Calcule
a força de atração/repulsão entre as cargas utilizando a expressão matemática
da Lei de Coulomb:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
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= 10-9 C





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&nbsp; &nbsp; &nbsp;5)&nbsp; O
que é o campo elétrico? Quais as duas grandezas físicas que o caracterizam?

<!--[if !supportLists]-->6)&nbsp;&nbsp;Calcule a intensidade do campo elétrico no
ponto P gerado por uma carga elétrica, sabendo que este campo interage com
outra partícula de carga 2C, exercendo sobre ela uma força de 10N.

<!--[if !supportLists]-->7)&nbsp;Qual a força exercida por uma partícula
carregada sabendo que a intensidade do campo elétrico é 20N/C no ponto em que
se encontra outra partícula de carga 0,2 C?

<!--[if !supportLists]-->8)&nbsp;Descreva o que é o potencial elétrico de um
campo. 

Eletrodinâmica

<!--[if !supportLists]-->1)&nbsp;O que é diferença de potencial (ddp) ou
tensão elétrica? Em que unidade é medida?

<!--[if !supportLists]-->2)&nbsp;O que é Corrente Elétrica? E resistência
elétrica? Quais são suas unidades de medida?

<!--[if !supportLists]-->3)&nbsp;Use a Lei de Ohm e calcule a resistência elétrica
de um fio por onde passa uma corrente de 10 ampères e uma tensão de 220 volts. 

<!--[if !supportLists]-->4)&nbsp;Calcule a potência elétrica de um chuveiro
elétrico que consome 2000J de energia elétrica em 10s. 

<!--[if !supportLists]-->5)&nbsp;Qual o consumo de energia elétrica em reais,
sabendo que existe somente um chuveiro elétrico de 4kW de potência &nbsp;numa residência e que ele permanece ligado por
1,5 horas por dia. Considere que &nbsp;um mês
tenha 30 dias e que cada 1 kWh custa R$ 0,25.

<!--[if !supportLists]-->6)&nbsp;<!--[endif]-->Numa casa existem uma TV ligada 4h por dia,
três lâmpadas de 100W acessas 10 horas por dia, uma geladeira de 2kW ligada por
5 horas diárias e um micro-ondas de 200W ligado por 1 hora por dia. Se cada 1
kWh custa R$ 0,45 , qual o valor a ser pago pela conta de luz no mês de Agosto
que tem 31 dias?

<!--[if !supportLists]-->7)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
Calcule a resistência elétrica
equivalente nos circuitos abaixo:




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