How to find B field in paralle plate capasitor

[leonne]

Homework Statement

how to find B field in parallel plate capacitor
the plates have a length L and width w and separated a distance h

Homework Equations

B dl=$$\mu$$ I

The Attempt at a Solution

I am trying to find the B files i thought u would use
B dl=$$\mu$$ I
but the book has the answer as B=$$\mu$$ K =$$\mu$$ I/W
I thought the answer would be like B=$$\mu$$ I/L does it have to do with the direction of the b files? the current is flowing to the right
thanks

 

[berkeman]

Homework Statement

how to find B field in parallel plate capacitor
the plates have a length L and width w and separated a distance h

Homework Equations

B dl=$$\mu$$ I

The Attempt at a Solution

I am trying to find the B files i thought u would use
B dl=$$\mu$$ I
but the book has the answer as B=$$\mu$$ K =$$\mu$$ I/W
I thought the answer would be like B=$$\mu$$ I/L does it have to do with the direction of the b files? the current is flowing to the right
thanks

Could you please clarify your question? Capacitors do not generate B-fields typically, so there must be more to this problem? Can you post the figure from the question?

 

[leonne]

well suppose to find the power transported down a cable of ex7.13 and problem 7.58., assuming the 2 conductors are held at pot diff V and carry current I
I did the one for 7.13 but this one is for 7.58
for problem 7.58
says a certain transmission line is constructed from 2 thin metal ribbons of width w a very small distance h apart the current flows down one strip back along the other

can't find a figure but its 2 rectangles parallel to each other