00:01
So in this question, we're told that a positively charged rod attracts a cork.
00:05
And we want to know if that means that the cork is necessarily negative.
00:09
And i would say, no, what can happen is the cork can polarize.
00:15
And so little dipole moments can form inside of it, meaning the left side is partially negatively charged.
00:22
And so that partial negative charge is going to be stronger than the further away positive charges.
00:30
And the material from the positively charged rod.
00:34
And so that negatively charged rod is going to be the predominant effect, which is going to be a traction.
00:42
And so i would say for a, the answer is no, it does not have to be negatively charged...