ChemPhys 173/273

Unit 10: Static Electricity

Problem Set A

 

Overview:

Problem Set A targets your ability to use equations related to electric charge, electric force and electric field intensity. There are 20 problems in this problem set which range in difficulty from the very easy to rather difficult. To be successful, you will need to understand at least three quantitative ideas. They are:

 

 

 

In addition to an understanding of the above mathematical quantities of charge, force and field, success on this problem set is dependent upon a conceptual understanding of the following principles.

 

Additional Readings/Study Aids:

The following pages from The Physics Classroom tutorial may serve to be useful in understanding the mathematics of electric force and electric field.

Coulomb's Law | Newton's Laws and the Electrical Force | Electric Field Intensity

 

View Sample Problem Set.

 

Problem

Description

Audio Link
1

Routine calculation of net charge on an object based on knowledge of the number of excess electrons.

2

Calculation of the net charge of an object based on the number of electrons and the number of protons.

3

Calculation of the net charge of an object based on the number of electrons and the number of protons.

4

Routine calculation of the electric force using Coulomb's Law.

5

Routine calculation of the electric force using Coulomb's Law.

6

Routine calculation of the electric force using Coulomb's Law.

7

Comparison of the gravitational force of attraction and the electric force of repulsion for two protons of imaginary mass.

8

Comparison of the gravitational force of attraction between moon and Earth and the fictional situation of an electric force being established due to the presence of charge.

9

Determine the separation distance between two vertically aligned electrons if the force of repulsion on the top electron is sufficient to cancel its gravitational attraction towards earth.

10

Use of Coulomb's law to determine the quantity of charge on two objects to produce a specified force at a specified distance.

11

Determine the electric field intensity at a given location based upon the amount of force experienced by a given test charge.

12

Determine the electric force exerted upon a proton when placed within a specified electric field.

13

Determine the strength of the electric field created by an electron at a given location.

14

Use Coulomb's law to determine a separation distance based upon the amount of force exerted between two known charges.

15

Determine the strength of an electric field created by a specified source charge at a given location.

16

Determine the quantity of charge which would produce the specified electric field intensity at the designated location.

17

Determine the net electric field created by the hydrogen nucleus at a location where the electron orbits.

18

Determine the net electric field at the midpoint between two charges by first determining the individual electric field vectors.

19

Use Coulomb's law to determine individual electric force vectors and then sum them up to determine the net electric force.

20

Use Coulomb's law to determine individual electric force vectors and then sum them up to determine the net electric force.

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