A balloon, initially neutral, is rubbed with fur until it acquires a net char of

Question

A balloon, initially neutral, is rubbed with fur until it acquires a net char of -x nC. (a) Assuming that only electrons are transferred, how many electrons were transferred? Find the total positive charge of all the protons in x gm of CO_2 gas. A metallic sphere has a charge of +x nC. A negatively charged rod has a charge of - y nC. When the rod touches the sphere, x* 10^9 electrons are transferred. What are the charges of the sphere and the rod now? If the electrical force of repulsion between two same amount of charges N, and they are y* 10000 m apart. What is the magnitude of each charge? points.

Explanation / Answer

1) number of electrons transferred = (8 * 10-9)/(1.6 * 10-19)

                                                      = 5 * 1010

2) total positive charge = (8/44) * 1.6 * 10-19

                                                      =    2.91 * 10-20 C

3) charge of sphere = 8 * 10-9 - 8 * 109 * 1.6 * 10-19

                                  = 6.72 nC

    charge of rod = - 5 * 10-9 + 8 * 109 * 1.6 * 10-19

                                  = - 3.72 nC

4) Here,    8 = 8.98 * 109 * q2/(50000)2

=> q = 1.492 C

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