Electric Field and Forces

On which quantity depends electrostatic force

• mass

• distance

• speed

• electric constant

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NGSS.HS-PS2-4

Coefficient proportionality (k) is equal to

• 8,85*10^-12 C²/ N*m²

• 8.99*10⁹ N*m²/C²

• 3*10⁸ m/s²

• 1,38*10^-23 J/K

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

How will change the elecrostatic force, if a distance increase by 3

• will not change

• will increase by 3

• will decrease by 3

• will decrease by 9

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

How will change the electrostatic force, if the charges of both bodies decrease by 2

• will decrease by 4

• will decrease by 2

• will not change

• will increase by 4

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

What is Coloumb's Law?

• F = kq₁q₂/r₂

• F = q₁q₂ + r₂

• F = m × a

• F = q₁/q₂

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NGSS.HS-PS2-4

In the diagram below, P is a point near a negatively charged sphere. Which direction best represents the direction of the electric field at point P?

• Right
• Left
• Up 
• Down

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NGSS.HS-PS2-4

A point charge Q is far from all other charges. At a distance of 2 m from Q, the electric field is 20 N/C. What is the force a charge of 5 Coulombs feels?

• 4 N
• 100 N
• 40 N
• 10 N

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

Consider the electric field lines shown in the diagram below. From the diagram, it is apparent that object A is ____ and object B is ____.

• +,+
• +,-
• -,+
• -,-

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NGSS.HS-PS2-4

An electrostatic force of 2 X 10². newtons is exerted on a charge of 4 coulomb at point P in an electric field. The magnitude of the electric field intensity at P is

• 8 X 10² N/C
• 5 N/C
• 2 X 10^-2 N/C
• 50 N/C

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NGSS.HS-PS2-4

A positive test charge of 8.7 μC experiences a force of 8.1x10^-6 N at an angle of 24° N of E. What are the magnitude and direction of the electric field strength at the location of the test charge?

• 7.0x10^-8 N/C, 24° N of E

• 1.7x10^-6 N/C, 24° S of W

• 1.1x10^-3 N/C, 24° W of S

• 9.3x10^-1 N/C, 24° N of E

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NGSS.HS-PS3-5