Quiz, Chapter 17, 18

Student Last Name__________________________First Name_____________________9/24/2014

1. Two point charges are placed on the x axis as follows:
Charge q1 = 1 mC is located at x =  1 m, and charge q2 = 2 mC is at x = -3 m.
What are the magnitude and direction of the net force exerted by these two charges on a third charge q3 = -1  mC placed on the origin?

2. Charge q1 = 3 mC is located on the x axis at x =  -1 m, and charge q2 = 1 mC is located on the y axis at y = -0.5 m.
What are the magnitude, the x and y components, and the angle with the x direction of the net force exerted by these two charges on a third charge q3 =  1  mC placed on the origin?

3. A point charge of -4 nC is at the origin, and a second point charge of -1 nC is on the x axis at x = 6 m. Find the magnitude and direction of the  electric field at each of the following points on the x axis:
(a) x = 4 m,
(b) x = 12 m.

4. A point charge Q = 1 mC is held fixed at the origin. A second point charge q = 2 mC with mass of 1 kg is placed on the x axis , 1 m from the origin.
(a) What is  the electric potential energy U of the pair of charges?
(b) The second point charge is released from rest. What is its kinetic energy when its distance from  the origin is
(i) 2m;
(ii) 20 m;
(iii) 200 m.  

5. A 1 mF capacitor is connected to a power supply that keeps a constant potential difference of 1 V across the plates. A piece of material having a dielectric constant of 4 is placed between the plates, completely filling the space between them.
How mach energy is stored in the capacitor before and after the dielectric is inserted?

Why Are Astronauts Weightless?

Why Are Astronauts Weightless?
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Online Home Work

The online homework for extra-credits

Section 22LC http://connect.mheducation.com/class/v-znamenskiy-22lc
Section 23LC http://connect.mheducation.com/class/v-znamenskiy-23lc

 If you execute the online homework for extra-credits then it is not necessary to execute the regular homework. 
However regular homework together with online will give you more high extra credit