1. First nib the glass rod with silk. Now give some of the charge from the glass

Question

1. First nib the glass rod with silk. Now give some of the charge from the glass md to the scope by touching the glass rod to the metal contact at the top of the electroscope. a) What charge is given to the electroscope? Explain, and sketch the charge configuration. b) What happens to scope when the rod touches the contact? Explain what you see. c) What happens to the scope's conductive rod when you take the rod away? Why does it do this? 2. With the scope still charged from (1), again bring the charged glass near the scope's contact but this time do not touch them together. What happens to the conductive rod and why? Draw the relevant charge configuration. 3. Wave the glass rod back in forth so that it is sometimes near and sometimes far from the con tact. What happens to the scope? Does waving the rod transfer any energy to the conductive rod? 4. In general, energy takes a finite amount of time to travel from any one place to any other. The fundamental limitation is that energy cannot be transferred faster than the speed of light. So. there must be a finite amount of time between when the energy leaves the rod and arrives at the conductive rod what form is the energy stored during this in-between time? 5. Bring the silk cloth near the electroscope with the electroscope still charged as in (1). What happens to the conductive rod and why? Draw the releva

Explanation / Answer

1. A glass rod when rubbed against a silk cloth acquires a positive charge.

    a. Positive charge is given to elctroscope as glass rod was positively charged.

    b. When the rod touches the contact, leaves spread apart in a 'V' shape.

2. Since both rod and contact are positively charged, the charged rod will push the positive charge further towards the leaves, thus spreading them further apart.

3. The leaves with converge and diverge in the same frequency as that of to and fro movement of rod. So, the waving of rod do transfer energy.

4. Kinetic Energy of charged particle

5. The leaves will get back together as negative charge of silk rod will pull the positive charge towards the contact.

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