# Equivalence principle question

1. Sep 1, 2013

### JamesClarke

Hey, you know the way einstein said that its impossible to tell if youre in a box that is accelerating or in a gravitational field? But, dont accelerating charges radiate? so theoretically, by looking at these charges you could in fact tell the difference ? I dunno, maybe I`m missing something, I usually am.

2. Sep 1, 2013

### WannabeNewton

Einstein's equivalence principle applies only locally; an accelerating charge carries an electromagnetic field which extends out globally.