Electrostatics

Electrostatic force F exists between two point charges. If the both charges are doubled, the force between the charges will be

• F
• 4F
• 2F
• F/4

Tags

NGSS.HS-PS2-4

The electric field inside a charged conducting sphere of radius R is

• $\frac{1}{4\pi\epsilon_0}\ \frac{q}{R^2}$

• $\frac{1}{4\pi\epsilon_0}\ \frac{q}{r^2}$

• $\frac{1}{4\pi\epsilon_0}\ \frac{q}{R}$

• 0

Which of the following is a false statement about electrostatic force.

• Bringing charges closer together strengthen the force.
• The electrostatic constant remains the same.
• The values of the two charges is always the same.
• Electrostatic force can be attractive or repulsive

Tags

NGSS.HS-PS2-4

Two similar metal spheres, A and B, have charges of +2.0 x 10^-6 coulomb and +1.0 x 10^-6 coulomb, respectively. The magnitude of the electrostatic force on A due to B is 4.0N newtons. What is the magnitude of the electrostatic force on B due to A?

• 2.0N
• 4.0N
• 8.0N
• 1.0N

Tags

NGSS.HS-PS2-4

The SI unit of charge is

• the ampere
• the newton
• the coulomb
• the joule

Tags

NGSS.HS-PS2-4

When the distance between two charges is halved, the electrical force between the charges

• quadruples

• reduces to one fourth

• halves

• doubles

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

2 charges feel a force of 40 N. if we cut the distance between them in half, what is the new force they feel

• 20

• 80

• 160

• 10

Tags

NGSS.HS-PS2-4

The force of attraction between two charges is given by

• $\frac{1}{4\pi\epsilon_0}\ \frac{q_1q_2}{r^2}$

• $\frac{1}{4\pi\epsilon_0}\ \frac{q_{ }}{r^2}$

• $\frac{1}{4\pi\epsilon_0}\ \frac{q_1q_2}{r^{ }}$

• $\frac{1}{4\pi\epsilon_0}\ \frac{q_1q_2}{r^3}\ \overrightarrow{\ r}\$

What is the electric field inside a spherical shell?

The potential inside a uniformly charged spherical shell of radius R and surface charge density  $\sigma$  is

•  $\frac{R^2\sigma}{\epsilon_0z}$  

•  $\frac{R\sigma}{\epsilon_0}$  

•  $0$  

•  $\frac{1}{4\pi\epsilon_0}\ \frac{\sigma}{R}$