# Polarity of induced voltage

1. Feb 25, 2012

### johnstamos

1. The problem statement, all variables and given/known data

This is seriously going to drive me insane. I know that a time changing B field produces a curling E field. For case #1, I have an open circuited loop with a B field increasing out of the page. This should create a polarity indicated in my picture.

I hook up a load to it. I have an electric field curling in the clockwise direction, E is proportional to current density, and so the polarity across the terminals should be reversed.

And yet my prof/all other people keep telling me that the polarity stays the same. So by connect a load, we actually reverse the direction of the electric field?

2. Relevant equations

Curl E = -dB/dt;

3. The attempt at a solution

see above

https://dl-web.dropbox.com/get/Public/Photo%20Feb%2025%2C%201%2053%2009%20AM%20%281%29.jpg?w=e2e0f3fc

2. Feb 25, 2012

### vivekrai

'Picture' ? You missed it.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook