Recall the lab activity where you brought a charged teflon rod close (but not to
ID: 2227064 • Letter: R
Question
Recall the lab activity where you brought a charged teflon rod close (but not touching or sparking) to the electroscope while your partner hold his/her finger on the top of the brass support. You observed a deflection of the metal tube in the electroscope indicating that the tube is charged. Answer the following question.
(a) What will happen if your partner removes his/her finger first and then bring the teflon rod far away from the electroscope?
the metal tube will be deflected even more.
the metal tube will come to the vertical orientation indicating zero net charge on the electroscope.
the metal tube will stay deflected.
(b) What will happen if you bring the teflon rod far away from the electroscope before your partner removes his/her finger?
the metal tube will be deflected even more.
the metal tube will stay deflected.
the metal tube will come to the vertical orientation indicating zero net charge on the electroscope.
(c) What will happen if you bring the charged teflon rod close to the metal tube (but not touching or sparking), and then bring the teflon rod far away from the metal tube without touching the brass support? (Imagine that you repeat the activity without touching the brass support.)
the metal tube will stay in vertical position always.
the metal tube will deflect only when the teflon rod is close.
the metal tube will deflect only when the teflon rod is far away. the metal tube will deflect always.
It is necessary always to charge the same end of the teflon rod because
Explanation / Answer
a)the metal tube will stay deflected b)the metal tube will come to the vertical orientation indicating zero net charge on the electroscope. c)the metal tube will deflect only when the teflon rod is close. the concept to be used in answering all questions is : teflon is a insulator which you charge by static friction (positive). when you bring the rod close to the metal bob of electroscope it attracts the opposite charge(-ve) to the bob end(bound charges) while the leaves shall have the opposite charge (+ve)(free charge) while touching the electroscope you can earth the free charges but the bound charges shall remain provided the teflon is still held close while grounding(1st case). if the teflon is removed before your friend removes his finger , the net charge gets grounded and electroscope becomes neutral
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