ChemPhys 173/273

Unit 10: Static Electricity

Problem Set B

 

Overview:

Problem Set B targets your ability to use the perform complex analysis of physical situations by combining equations of electric force and electric field strength with trigonometry, vector principles and other physics principles learned throughout the course. The concepts and mathematics associated with electric force and electric field permeate the entire set. To be successful, you will have to understand these ideas.

 

 

 

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.

 

 

Fgrav = m1 • g
where m is the mass of the object (in kg) and g is 9.8 m/s/s.

 

 

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

Combine electric field analysis with Newton's laws and kinematics to determine the final velocity of an electron accelerated by an electric field.

2

Analysis of a configuration of three charges forming a right triangle; use Coulomb's law and vector principles to determine the magnitude of net electrostatic force on one of them.

3

Referring to the previous problem; determine the direction of the net electrostatic force.

4

Analysis of a configuration of three charges forming an isosceles triangle; use Coulomb's law and vector principles to determine the magnitude of net electrostatic force on one of them.

5

Referring to the previous problem; determine the direction of the net electrostatic force.

6

Analysis of two charged metal spheres hanging by same-length strings from the same pivot point; use Coulomb's law and vector principles to determine the charge on each sphere.

7

Analysis of two charged objects placed along an x-axis to determine the location along the axis where a third charge could be placed to have a net electrostatic force of 0 N.

8

Referring to problem #2 above; determination of the net electric field based on the amount of charge and an already-calculated force.

9

Analysis of a configuration of three charges forming an equilateral triangle; use Coulomb's law to determine the magnitude of the net electric force at one of the corners.

10

Referring to the previous problem; determine the direction of the net electric force at one of the corners.

11

Analysis of two charged objects placed along an x-axis to determine the location along the axis where the net electric field is 0 N/C.

12

A charge plastic ball is hung from a ceiling by a string in the presence of a uniform electric field and deflects from its downward orientation; determine the net charge on the sphere.

13

Analysis of two charged objects placed along the y-axis to determine the location along the axis where a third charge could be placed to have a net electrostatic force of 0 N.

14

Multiple step problem in which the charge of two objects must first determined by the number of deficient electrons and then the electrical force determined using Coulomb's law.

15

Analysis of an electron orbit in the Bohr atomic model to determine the speed of the electron from circular motion principles and Coulomb's law.

16

Analysis of a configuration of four charges along the x-axis to determine the acceleration of a fifth charge placed at the origin.

17

Analysis of a configuration of four charges forming a sphere to determine the magnitude of the electric field at the center of the sphere.

18

Comparison of the electrostatic repulsion force between two identically charged spheres to the gravitational force of attraction towards Earth; determine the charge on each sphere.

19

Analysis of two charged balloons hanging by same-length strings from the same pivot point; use Coulomb's law and vector principles to determine the charge on each balloon.

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