Homework in physics 2 in Electricity and Magnetism

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I have assignment in physics 2 and its in chapter Electricity and Magnetism the homework below .

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PHYS 206.002: Electricity and Magnetism Assignment: Week 2 1. (20 points) In a thundercloud, there may be electric charges of +50.0 C near the top of the cloud and −100.0 C near the bottom of the cloud. These charges are separated by 2.00 km. What is the electric force on the top charge? 2. (20 points) Three point charges are arranged as shown below. Find (a) the magnitude and (b) direction of the electric force on the particle at the original. 1 3. (20 points) Three point charges lie along a straight line as shown below, where q1 = 10.00 µC, q2 = 2.00 µC, and q3 = −5.00 µC. The separation distance are d1 = 5.00 cm and d2 = 2.00 cm. Calculate the magnitude and direction of the net electric force on (a) q1 and (b) q2 . 4. (20 points) Two small beads having positive charges q1 = 3q and q2 = q are fixed at the opposite ends of a horizontal insulating rod of length d = 2 m. The bead with charge q1 is at the origin. As shown below, a third small, charged bead is free to slide on the rod. At what position x is the third bead in equilibrium? 2 5. (20 points) Two small metallic spheres, each of mass m = 0.100 g, are suspended as pendulums by light strings of length L as shown below. The spheres are given the same electric charge of 10.0 nC, and they come to equilibrium when each string is at an angle of θ = 5.00◦ with the vertical. How long is the strings? 3
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Here is my answer :)

Homework in physics 2 in Electricity
and Magnetism
1- In a thundercloud, there may be electric charges of +50.0 C near the top of
the cloud and −100.0 C near the bottom of the cloud. These charges are
separated by 2.00 km. What is the electric force on the top charge?
k = 9*109 N*m2/C2

(

)

2- Three point charges are arranged as shown below. Find (a) the magnitude
and (b) direction of the electric force on the particle at the original.

Fx is directed in the –x direction because the charge repeal each other. Then:

(

)

Fy is directed in the –y direction, then:

(

)

)

(

a) Magnitude


√(

)

b)
(
(

)
)

Since the two components are negative, the direction of the force is 180+77.5 =
257.5
3- Three point charges lie along a straight line as shown below, where q1 =
10.00 µC, q2 = 2.00 µC, and q3 = −5.00 µC. The separation distance are d1
= 5.00 cm and d2 = 2.00 cm. Calculate the magnitude and direction of the
net electric force on (a) q1 and (b) q2.

a) Force on q1

(

)

(

)

b) Force on q2

(

)

(
to the right

)

4- Two small beads having positive charges q1 = 3q and q2 = q are fixed at the
opposite ends of a horizontal insulating rod of length ...


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