Homework Help on Kirchoff's Laws and Magnetic Induction

[Dhooy7]

Homework Statement

I am stuck on 2 and 3.

I attached all the problems and variable and unknowns

Homework Equations

I attached my work for 1, 2, and 3. I'm not sure if it is right though. [/B]

The Attempt at a Solution

Can someone check my work for problems 1, 2, 3 and 4?

The equations, attempts and relevant information is attached!

I'm stuck on 4-13 but have no answers or don't know where to start

 

[gracy]

In second problem of your attached pdf ,unit of magnetic flux is given to be tesla,it is incorrect.It should be Wb.
Then the problem becomes easy.Just apply faraday's law of electromagnetic induction.
One more thing ,in faraday's law make sure you have included number of loops.

 

[Dhooy7]

gracy, I am confused because the problem says 0.04T to 0.3 T. What do you mean the answer should be in Webers?

 

[gracy]

. What do you mean the answer should be in Webers?

I am not talking about answer rather second QUESTION.

 

[Dhooy7]

What do you mean second Question? . From homework 8, I am looking at problem 2.

 

[gracy]

From homework 8, I am looking at problem 2.

Yes ,I am talking about that only.

 

[Dhooy7]

So it should be 0.26 Webers? Or are you saying I need to convert that to webeters to use it in the emf equation?

 

[gracy]

Ok.Just look at faraday's law f electromagnetic induction,and tell me it has magnetic flux or magnetic field?

 

[Hesch]

In problem 1, you can use fewer equations: Naming the loop currents L1 and L2, they must be:

Loop 1: 8V - L1*50Ω - 10V - L1*200Ω + L2*200Ω = 0
Loop 2: 40V - L2*200Ω + L1*200Ω + 10V= 0

The voltage change over R3 is caused by both L1 and L2 as they both pass R3.

Having solved L1 and L2, you can easily calculate I1 = L1, I2 = L2, I3 = L1 - L2

 

[Dhooy7]

magnetic flux.

 

[gracy]

magnetic flux.

Good.What is the unit of flux?

 

[Dhooy7]

I guess I don't understand where you are going with this.

 

[Dhooy7]

In the book it uses m^2T

 

[gracy]

In the book it uses m^2T

For what?

 

[Dhooy7]

magnetic flux.

 

[gracy]

Yes.Actually magnetic flux SI unit is Weber (symbol Wb)And one weber per square metre is one tesla(T)
I hope you now understand what is wrong with the problem 2 of homework 8,

 

[Dhooy7]

It's the units for flux to use

 

[Dhooy7]

Did I do 3 and 1 correctly?

 

[Dhooy7]

Can anyone give me assistance on 4-13 on how to start. I've looked in my book several times.

 

[gracy]

So what is your answer of problem 2 of homework 8,?

 

[Dhooy7]

The emf was right. It was 0.37 V.