PHY2049 - GENERAL PHYSICS II
PRACTICE QUIZ 22

Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 22, "The Electric Field II: Continuous Charge Distributions". This includes questions on the electric field from Coulomb's Law and Gauss' Law, charges and fields at surfaces. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.


Q1: An infinite line charge of linear charge density 0.30 × 10-6 C/m lies along the z axis and a point charge q = 6.0 × 10-6 C lies on the y axis at y = 2.0 m, as shown below.

The y component of the electric field at the point P on the x axis at x = 3.0 m is approximately

1.8 kN/C
2.3 kN/C
0.96 kN/C
4.2 kN/C
2.8 kN/C


Q2: An infinitely long cylindrical shell of radius 6.0 cm carries a uniform surface charge density of 12 nC/m2. The electric field at r = 10 cm is approximately

1.2 × 104 N/C
5.6 × 102 N/C
1.3 × 103 N/C
8.1 × 102 N/C
zero

Q3: A solid spherical conductor has a radius of 15 cm. The electric field 30 cm from the center of this sphere has a magnitude of 800 N/C. What is the surface charge density on the sphere?

7.1 × 10-9 C/m2
1.0 × 10-8 C/m2
1.4 × 10-8 C/m2
2.8 × 10-8 C/m2
1.1 × 10-7 C/m2

Q4: The electric field inside an insulator is always zero.

True
False

Q5: Two positive charges are located at points A and B as shown in the figure. The distance from each charge to the point P is a = 2.0 m.

Which statement is true concerning the direction of the electric field at P?

The direction is toward A.
The direction is toward B.
The direction is directly away from A.
The direction makes a 45° angle above the horizontal direction.
The direction makes a 135° angle below the horizontal direction.


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