# Charge on an Electron

1. An inflated rubber balloon is rubbed with a wool cloth until an excess of a billion electrons is on the balloon. What is the magnitude of the charge on the balloon?

2. What is the force between two balloons with a negative charge of 1.6x10-10c if the balloon s are 5.0cm apart?

3. How much energy is available from a 12V storage battery that can transfer a total charge equivalent to 1000,000C?

6. There is a current of 0.83 A through a lightbulb in a 120V circuit. what is the resistance of this lightbulb?

7. What is the voltage across a 60.0 resistor with a current of 31/3 amp?

9. A lightbulb designed to operate in a 120.0V circuit has a resistance of 192 At what rate does the bulb use electric energy?

11. An electric motor draws a current of 11.5 A in a 240V circuit. what is the power of this motor in W ?

13. Is it impossible for two people to simultaneously operate 1300W hair dryers on the same 120V circuit without tripping a 15A circuit breaker? Explain?

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#### Solution Preview

Please find the solution in the attachment.

Phsyical science Book Bill W.Tillery 8th edition ( need shown steps taken to produce the correct answer)

1. An inflated rubber balloon is rubbed with a wool cloth until an excess of a billion electrons is on the balloon. What is the magnitude of the charge on the balloon?

Ans. Charge on an electron = 1.6 x 10¬-19

Total Charge = number of entities multiplied by charge on ...

#### Solution Summary

Rate of energy and other concepts are studied and discussed in the solution.

Electric Charge: Electrons and Net Attraction

See the attached file.

1.) When you pull two socks out of a clothes dryer they stick to each other due to an accumulation of static charge. How many electrons are responsible for this net attraction?

Let?s make an estimate following these steps: A sock has a mass of about 15g. How large (in newtons) is the gravitational force on one sock? Assuming that the sock?s mass is equally distributed between protons and neutrons (mp ? mn = 1.67 × 10?27 kg) how many protons are in the sock? As matter is mostly composed by neutral atoms, this is also a good estimate of the total number of electrons in the sock.

Assume that some number n of electrons is transferred from one sock to the other leaving the first sock with a charge q = +ne and the second sock with charge q2 = ?ne. Further assume that when the socks cling to each other these charges are separated by about 1 mm.

In terms of n, how large is the electrical attraction of one sock to the other? Equate this to the weight of the sock to solve for n. What is the total charge transferred in units of coulombs? What fraction of the total number of electrons in the sock does n represent?

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