Multiple-Choice Problems Wednesday Homework Problem 2.1 The nucleus of an atom i

Question

Multiple-Choice Problems Wednesday Homework Problem 2.1 The nucleus of an atom is composed of protons and neutrons Protons have a positive charge and neutrons are neutral. The nucleus is held together by the strong force which is far stronger than the electric force at very short distances. If the strong force did not exist, could the electric force hold the nucleus together? Select One of the Following: (a) yes (b) no Wednesday Homework Problem 2.2 An electrophorus is a flat metal plate with an insulating handle. The electrophorus is charged by grounding the plate while it sits on a charged dielectric. If an electrophorus is charged by grounding on a positively charged dielectric, what net charge does the electrophorus acquire? Select One of the Following (a) positive (b) negative Wednesday Homework Problem 2.3 One insulating sphere initially has charge Q1> 0 and another insulating sphere has Q2 30. The spheres are then connected with a conducting wire. What is the approximate sign of the charge on each sphere? Assume that there are no losses to the environment. Select One of the Following: (a) 21-0, Q2 0 (b) >0, Q2 0 (c) Q 0, Q2 00 (d) Q1> 0, Q2> 0 (e) Q1 0, Q2

Explanation / Answer

2.1 :   No

The nuclues is composed of positive protons and neutrons. the neutrons are neutral . we know that like charges repel each other and the closer they are , stronger is the force of repulsion.hence electric force can not keep nucleus together

2.2 :

Negative

Since all the positive charge goes to the ground. hence charge left is negative

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