I have a couple of questions which come under the above title.
1) Firstly if we bring a negatively charged rod near a sphere (Fig 1 and 2)
The end A would get positively charged and the end B will get negatively charged. Now if I ground the sphere (in that same position ) , the negative charge or electrons will flow down to the ground. Now what would be a correct explanation for the flowing of electrons ? I am asking this because some people say that the negative charges should be held in place by the positive charges. 2) Also what would happen if we connect the end A to the ground (Fig 3)?
3) If I have a battery and I just connect the positive terminal to a wire (the circuit is incomplete). Will any charge develop on end (A) of the wire?
I am asking this because I read here on Stack Exchange that the end A will get charged but the charge would be very less due to the very small capacitance of the wire. How can we calculate the charge developed on A if we know the capacitance of the wire and the voltage of the battery 4) Finally we have a capacitor in place of a battery and we connect the negative plate to a wire ( Fig 4).
Will any charge develop on the end A of the wire. I am asking this because I think that (this should also be in the case of the battery) that electrons shouldn't be able to flow from the negative plate to the end A of the wire because the electrons in the negative plate are held in place due to attraction by the positive charges on the other plate?