00:01
So in this question, we're told that two bodies are attracting each other electrically, and we want to know if they both have to be charged, and then we want to answer the same if they are repelling.
00:09
So if they're attracting each other, they don't have to both be charged.
00:14
One can be charged, and the other can just polarize.
00:19
So let's say this is negatively charged.
00:22
This object, if it has the right material properties, it can polarize, and then it, and that'll form an attraction because this left side will be partially positive, and the left side is closer to the negative charge than the other negative charges within the material.
00:41
And so that's going to lead to a net effect of attraction.
00:46
So this can this can still be neutral, and then this can be negative, and there can still be attraction...