Electricity and Magnetism Answers

1. Two charges Q1=-5 NC and Q2=-7 nc are separated by 8 cm. Calculate tHe electric potential at point.

2. A research van de Graaf generator has a 2.50 mm diameter sphere with a charge of 6.00 UC on it.

A. What is the potential near its surface?

B. At what distance from its center is the potential 1.50 MV?

Two charges lie on positive x-axis. Charge A (5.0 x 10^-9 C) is 4.0 cm from the origin and Charge B is 6.0 cm from the origin. (-7.0 x 10^-9 C). What is the total force exerted by these two charges on Charge C (8.0 x 10^-9 C) located at the origin?

Two charges lie on positive x-axis. Charge A (5.0 x 10-9 C) is 4.0 cm from the origin and Charge B is 6.0 cm from the origin. (-7.0 x 10-9 C). What is the total force exerted by these two charges on Charge C (8.0 x 10-9 C) located at the origin?

 solve for the Force of 2 charges, q1 = -63 nC and q2 = +42 nC with a distance of 5.5 cm. (Note: ϵ0 has a value of 8.85 x 10⁻¹² C²/ N m²) (C²/ N m²)

Find the potential at a distance of 0.07 m from a -6 nC charge

Spheres A, B, and C have charges +8.0 𝐶, +12.0 𝐶, and −5.0 𝐶, respectively. The three spheres are allowed to touch each other simultaneously and then separated. (a) What is the total charge on the three spheres before and after touching each other? (b) What is the final charge on each sphere assuming they are identical? (c) What is the final charge on each sphere assuming that 𝑟_𝐴=𝑟_𝐵=2𝑟_𝐶?

1. The potential energy of a certain system of two charges increases as the charges are moved farther apart. What does

this tell us about the sign of the charges? Why?

2. Show that volt per meter is the same as newton per coulomb.

3. A student said "electric potential is always proportional to potential energy; why bother with the concept of potential at

all? How would you respond?

1. Compute the force of attraction between

a +1.60 x 10 ^-19 C charge and a -2.09 x 10^-18 C charge if they are 4.01 x 10^-10 m apart.

2. Two ball bearings with opposite charges are 1.11 m apart on the floor on the floor. What are their charges if they are attracted to each other with a force of 5.11 N?

3. Compute the electric field experienced by a test charge q =+0.80μC from a source = +0.15μC in a vacuum when the test charge is places 0.20 m away from the other charge.

4. A.

E = 3.4 x 10^23 N/C

A = 2.3 x 10-2m²

Cos = 84⁰

B.

E= 8.2 x 10^5 N/C

A = 6.1 x 10^-7m²

Cos = 90⁰

2 charged particles reacted with a force of 0.31 N with a distance of 1.5 cm, the 2nd charge contains 54 nC. Find the value of the first charge