Physics Answers

1.Two point charges, Q_A = +8 μC and Q_B = -5 μC, are separated by a distance r = 10 cm. What is the magnitude of the electric force? The constant k = 8.988 x 10⁹ Nm²/C

2.Two charged particles Q_P = +10 μC and Q_q = +20 μC are separated by a distance r = 10 cm along the horizontal. What is the magnitude of the electrostatic force?

A light ray strike an air/water surface at an angle of 46 degrees with respect of the normal. find the angle of refraction when the direction of the ray is from the air to water

Which of the following is TRUE about the speed in a vacuum of these colors of light? 

A. All colors of light have equal speed in a vacuum.

B. All colors of light have varying speeds in a vacuum.

C. Violet light has the highest speed while the red light has the lowest speed.

D. Red light has the highest speed while violet light has the lowest speed.

Calculate the electric field experienced by a negative test charge given the following

conditions:

a. Source charge: +5.03 x 10-4 C

Distance from source charge: 2.33 x 10-5 m

b. Source charge: -4.33 x 10-12 C

Distance from source charge: 4.6 x 10-19 m

c. Source charge: +6.78 x 10-15 C

Distance from source charge: 7.9 x 10-19 m

Calculate the electric flux for each of the following sets of variables.

a. Electric Field = 7.06 x 1013N/C

A = 4.4 x 10-6 m2

θ = 0°

b. Electric Field = 6.9 x 103 N/C

A = 3.1 x 10-3 m2

θ = 45°

c. Electric Field = 8.2 x 105 N/C

A = 6.1 x 10-7 m2

θ = 90°

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?

Suppose the resistance is 1.47 Ω at a temperature of 20°C. Find the resistance at 0 degree Celsius.

A closed surface which encloses a charge has an electric flux of 15.8 N.m^2/C. What is the magnitude of the charge?

An electric field (E=4.5N/C) passes through a flat surface area (0.30m) with an angle of 45°. What will be the magnitude of the electric flux?

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?