Lukáš Dufka Posted June 20, 2014 Share Posted June 20, 2014 Hi, I have a question. Electric current in the circuit according to the relation I=1-10cos(50t). Determine the time when the Q=0 C. I used: I =dQ/dt Q(t) = ∫ Idt = ∫(1-10cos(50t))dt = t - (10/50)sin(50t) + C = t - 0.2sin(50t) + C But what now ? I donť known how can i calculate the time... Someone told me that i must find the interval of definite integral... from t=0 to t=?.... Thank you for reply. Quote Link to comment Share on other sites More sharing options...

0 FizziksGuy Posted June 20, 2014 Share Posted June 20, 2014 Right, I would integrate from time t=0 to some final time t=t, so your limits of integration are 0 to t. 1 Quote Link to comment Share on other sites More sharing options...

## Question

## Lukáš Dufka

Hi, I have a question.

Electric current in the circuit according to the relation I=1-10cos(50t). Determine the time when the Q=0 C.I used:

I =dQ/dt

Q(t) = ∫ Idt

= ∫(1-10cos(50t))dt

= t - (10/50)sin(50t) + C

= t - 0.2sin(50t) + C

But what now ? I donť known how can i calculate the time... Someone told me that i must find the interval of definite integral... from t=0 to t=?....

Thank you for reply.

## Link to comment

## Share on other sites

## 1 answer to this question

## Recommended Posts

## Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.