Physics Dellamorte 06_15 Electricity and Magnetism Review Packet Part 1: Electrostatic Charge and Coulomb s Law

Transcription

1 Physics Dellamorte 06_15 Electricity and Magnetism Review Packet Part 1: Electrostatic Charge and Coulomb s Law Name Two particles are interacting with each other, which of the below would be true? a. The gravitational force felt between them is larger than the electric force b. The electric force felt between them is larger than the gravitational force c. The gravitational force felt between them is the same as the gravitational force d. There is no way to tell k = (9x10 9 ) charges repel and charges attract. Draw a scenario of two particles interacting and repelling: Draw a scenario of two particles interacting and attracting: If two interacting particles have a negative force between them it means they are (circle one: attracting/repelling) If two interacting particles have a positive force between them, it means they are (circle one: attracting/repelling) A lightweight sphere hangs by an insulating thread. A student wishes to determine if the sphere is neutral or electro statically charged. She has a negatively charged hard rubber rod and a positively charged glass rod. She does not touch the sphere with the rods, but runs tests by bringing them near the sphere one at a time. The student notes that the sphere is attracted to the rubber rod and repelled by the glass rod. This test result shows that the charge on the sphere is Relationships: Indicate whether the below are direct, inverse, or inverse squared and draw the associated graph you would get if you were to graph these relationships. Distance and Electrostatic Force: Charge and Electrostatic Force: Rank the forces from Model 4 from most to least repulsive. Show all work. > > A x 10-4 C test charge is placed 8 x 10-2 m away from a 2.7 x 10-8 C test charge. What is the force between them? Two spheres have identical charges and are 5.75 m apart. The force between them is N. What is the magnitude of the charge on each sphere?

2 What is the distance between two spheres, each with a charge of 5.5 X 10-6 C, when the force between them is 5 N? A force of x N exists between a +7 charge and another mystery particle. The particles are 6.2 x 10-8 m apart. What is the charge of the mystery particle? (Hint: If the force has a negative value, what does that mean about whether the mystery charge is positive or negative?) r +2 C -4 C Two point charges q1 = +4 C and q2 = - 6 C are separated by a distance r, as shown above. If the force between the charges is 5 N, what is the value of r? An ion has a charge of 6.4 x 10-7 C. 6.2 x 10-4 meters away is a second charge with a charge of 8.6 x C. a. What is the strength of the electrostatic force between the ions? b. Is the force attractive or repulsive? Part 2: Electric Fields How did you know? Relationships: Indicate whether the (d) Make a star where you would expect the Electric Field Strength to be the weakest below are direct, inverse, or inverse squared and draw the associated graph you would get if you were to graph these relationships. Force and Electric Field Strength: (a) Is charge C positive or negative? (b) Is charge D positive or negative? (c) Is this showing two particles attracting or repelling each other? Charge and Electric Field Strength:

3 Observe the electric field lines below for various configurations. Determine which object in each diagram has the greater electric field strength. (Circle a letter for each picture) A or B C or D Where the field strength 3000 N/C, what is the force on a 5 C charge? An object has a charge of 3.0 C on it. Determine the electric field strength if the object is experiencing 6.2 x 10 3 N of force. What charge would have to be on a metal sphere if,.3 m from the center of the sphere, electric field strength=4 x 10 5 N/C? An ion with a charge of 4 x C experiences a force of 5 x 10-8 n, what is the strength of the electric field it is in? Draw the following scenarios:

4 Part 3: Magnetic Fields Draw the complete magnetic field around each of the objects shown below S N N S N S 3. S N S N 4. S N N S Which diagram(s) below is showing attraction? Which diagram(s) is showing repulsion? Draw a star on each of the below diagrams where you would expect to have the weakest magnetic field strength. Explain why the Magnetic North Pole of the Earth is the Geographic South Pole. Which letter would you expect to find each of the below arrows?

5