a) For each scenario describe the charged state of each of the pith balls in ter
ID: 3895300 • Letter: A
Question
a) For each scenario describe the charged state of each of the pith balls in terms of
whether it is like or unlike the electrode. Explain your reasoning.
Pith ball get the like charge of the electrode in Scenerio 1 but not sure about two
b) Assuming that the electrode is positively charged, describe the electron flows that
occur in each scenario.
c) If the initial charge on the electrode is Q (could be + or -) , what is the net charge of
each of the "systems" below after any charging of the pith balls has taken place:
System I: This system consists of the electrode and both pith balls in scenario 1.
System II: This system consists of the electrode and both pith balls in scenario 2.
System III: This system consists of only the two pith balls in scenario 2.
Explain how you know in each case.
I have the answers to all but idk how to give detailed explanation
A Wimshurst machine (just like in lab) is used to conduct some electrostatics experiments. In one experiment (scenario 1 below) two identical and initially uncharged pith balls (held on wooden sticks) separately touch one electrode of the machine after it has been charged. Recall that pith balls are covered with a conducting coating such as graphite. In a second experiment (scenario 2) the machine is recharged and the pith balls allowed to discharge so that they are again neutral. Holding the pith balls in contact the experimenter brings them close to one of the charged electrodes, one ball is closer than the other, but doesn't let either ball touch the electrode. Contact between the pith balls is then broken while they are in the vicinity of the electrode,Explanation / Answer
Scenario 1 : Pith Balls are brought in close contact with the electrodes. Whenever charge is transferred through conduction, similar charges will appear on both bodies i.e charging body and charged body. It's like : if charging body is negative i.e excess of electrons, then some electrons will flow to the pith balls making it negatively charged. HENCE, IN CASE OF CHARGING BY CONDUCTION< SIMILAR CHARGES APPEAR ON BOTH BODIES.
Scenario 2 : The balls are never brought in contact. This process is charging by induction. Here, suppose electrode is negatively charged and balls are brought close. The excess electrons of electrode will try to push the electrons of pith ball due to electrostatic repulsion. This will induce a positive charge on the ball which is close to th eelectrode. However, the repelled electrons have no where to escape. So, they will try to stay farthest from electrode i.e they will jump into other pith ball which is farther away making it a little negative. Now when the contact between balls is broken, the near one has POSITIVE charge while the farther one has NEGATIVE charge. IN CASE OF INDUCTION, OPPOSITE CHARGES APPEAR. however, to conserve the net amount of electrons the other ball gets a negative charge even though it was a conduction process. CHARGE IS CONSERVED NO MATTER WHAT HAPPENS.
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