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Chapter 1 Electrostatics

Last updated almost 2 years ago

9 questions

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Question 1

1.

How many electrons are required to yield a total charge of 1.00 C?

Question 2

2.

A current of 5.00 mA is enough to make your muscles twitch. Calculate how many electrons flow through your skin if you are exposed to such a current for 10.0 s.

Question 3

3.

Two identically charged particles separated by a distance of 1.00 m repel each other with a force of 1.00 N. What is the magnitude of the charges?

Question 4

4.

A silicon sample is doped with phosphorus at 1 part per 1.00 x 106. Phosphorus acts as an electron donor, providing one free electron per atom. The density of silicon is 2.33 g/cm3, and its atomic mass is 28.09 g/mol.
Calculate the number of free (conduction) electrons per unit volume of the doped silicon.

Question 5

5.

Calculate the magnitude of the electrostatic force the two up quarks inside a proton exert on each other if they are separated by a distance of 0.90 fm

Question 6

6.

Two initially uncharged identical metal spheres, 1 and 2, are connected by an insulating spring (unstretched length L0 = 1.00 m, spring constant k = 25.0 N/m), as shown in the figure. Charges +q and -q are then placed on the spheres, and the spring contracts to length L = 0.635 m. Recall that the force exerted by a spring is Fs = kΔx, where Δx is the change in the spring’s length from its equilibrium length. Determine the charge q. If the spring is coated with metal to make it conducting, what is the new length of the spring?

Question 7

7.

Find the magnitude and direction of the electrostatic force acting on the electron in the figure.

Question 8

8.

A +3.00 mC charge and a -4.00 mC charge are fixed in position and separated by 5.00 m.
a) Where can a +7.00 mC charge be placed so that the net force on it is zero?
b) Where can a -7.00 mC charge be placed so that the net force on it is zero?

Question 9

9.

The figure shows a uniformly charged thin rod of length L that has total charge Q. Find an expression for the magnitude of the electrostatic force acting on an electron positioned on the axis of the rod at a distance d from the midpoint of the rod.