Question
THANK YOU in advance!
plastic radcfrostatics Conductors and insulators Suspend the metal cup from the plastic rod attached to the stand and connect it as shown by means of a conducting wire to the knob of the electroscope. Use a proof plane to make a momentary connection between the knob and the grounded case (recall the ground wire, not shown) thus "shorting out' and completely discharging the electroscope. Important: Place the electroscope as far away from the cup as the wire permits. Next charge up the glass rod and hold it far away from both the electroscope and the cup. Now bring the glass rod closer to the cup, but not too close. (Do not let the rod touch the cup, or you know what may happen to the gold foil.) Observe the motion of the movable leaf metal cup conducting wire (a) What are the electrons doing in this case? electricity? (Are you absolutely sure? How could you find out whether or not your answer is correct?) (b) What would the electrons do if the wire were replaced by a dry string that does not conduct
Explanation / Answer
a)
here in this case leaves repels in each other
when the glass rod is get closure to the cup. so it charged because of induction .
next the charge flow to teh leaves of the electroscope & they repel with same charge.
so the resulting force of repulsion between 2 electrons is repel.
b )
in this case,
when wire is replaced by a string which is dry,
metal cup will acquire equal and opposite charges that the glass rod and the attraction force will result between
both of them.
