4 ms·
Magnetic force falls off pretty quickly - a phone case can cause enough of a difference to make that force lackluster. Apparently, it seems, enough to put magne
by FoomFries 6y ago
Magnetic force falls off pretty quickly - a phone case can cause enough of a difference to make that force lackluster. Apparently, it seems, enough to put magnets in the case itself to better maintain that force.
Additionally, it looks like the goal is to let your phone be held vertically, while attached only to the magnet. This makes sense for car mounts, where you may want to mount your GPS via magnet and charge it simultaneously.
- cmckn 6y agoCar mounts are a great point, thanks! I hope those magnets are strong though.
- toxik 6y agoHow fast you ask? Why it’s an inverse square law! Like gravity. 1/r^2.
- tgb 6y agoAt the risk of being pedantic (or misremembering college classes), there's more to it than that. First, at the relevant distance scales, the magnets aren't point particles, they have an extent and very close to that surface it should be 1/r. Secondly, magnets are dipoles and at greater distances the two poles cancel out to first order and you have a 1/r^4.