12th electrostatics

When distance increases, electrostatic force ____________; we call this relationship ____________ proportional

• decreases;directly
• decreases;inversely
• increases;inversely
• increases;directly

Tags

NGSS.HS-PS2-4

What variable is a Coulomb the unit for?

• Charge
• Force
• Distance
• Mass

Tags

NGSS.HS-PS2-4

The figure shows a neutral glass rod and a positively charged metal sphere.

Which of the following best describes the movement of charges as this glass rod touches the sphere?

• Positive charges move from the sphere to the glass rod.

• Negative charges move from the sphere to the glass rod.

• Negative charges move from the glass rod to the sphere.

• Positive charges move from the glass rod to the sphere.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is the electric force between a positive 2.5 C charge and a negative 1.3 C charge when they are separated by a distance of 10 m?

• -107,880,000

• -292,175,000 N

• 292,175,000 N

• 107,880,000

As two oppositely charged particles approach each other, what happens to the electrical force between them?

• The attractive force increases

• The magnitude of the electric force decreases

• The repulsive force increases

• The magnitude of their charges increases

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

What is the electric force between a 0.5 C charge and a 1.8 C charge when they are separated by a distance of 20 m?

• 404,550,000 N

• 20,227,500 N

• .045 N

• 129,456 N

Tags

NGSS.HS-PS2-4

Which two particles are attracted to each other?

• Two neutrons

• A proton and an electron

• Two protons

• An electron and a neutron

How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 × 10^-19 C)

• 6.3 × 10¹⁸ 
• 6.3 × 10⁹ 
• 1.6 × 10¹⁹ 
• 1.6 × 10⁹ 

Tags

NGSS.HS-PS2-4

What equation is this:
F_E= (k*q₁*q₂) / r² 

• Coulombs law
• Ohms law
• Newtons law

What is the name of this device that is used to detect charges?

• beaker
• electroscope
• van de graff generator
• chargometer