Coulomb's Law and Charge

The magnitude of the electric force between two charged objects is given by an equation known as:

• Coulomb's Law.

• Ohm's Law.

• Newton's Third Law.

• Murphy's Law.

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NGSS.HS-PS2-4

Coulomb's law also says if distance increases, then force

• decreases

• disapears

• destroyed in a heartbeat

• doubles

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NGSS.HS-PS2-4

What happens to the force between two charged objects if you reduce the distance between two objects from 30 cm to 10 cm?

• 3X

• 20X

• 9X

• 1/3X

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NGSS.HS-PS2-4

What is the value of Coulomb's Electrostatic Constant?

• 8.99 x 10⁹ Nm²C^-2

• 8.987 Nm²C^-2

• 8.987 x 10¹¹ Nm²C^-2

• 7.1 x 10^4.5 Nm²C^-2

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NGSS.HS-PS2-4

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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Based on the arrangement of the electric field lines in the diagram, what are the charges?

• both charges are the same

• the charges are opposite

• they are neutral; no charge

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When an object gains electrons it becomes __________

• Neutral

• Positively charged

• Negatively charged

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Before the balloons and sweaters are rubbed together, both objects are __________ charged. After they are rubbed together the sweater is __________ charged and the balloon is ___________ charged

• negative/positive/negative

• neutral/positive/negative

• positive/negative/neutral

• neutral/negative/positive

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NGSS.MS-PS2-3

An electrostatic force of 2 X 10² N is exerted on a charge of 4 Coulomb at point P in an electric field. What is the magnitude of the electric field intensity at P?

• 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

What variable is a Coulomb the unit for?

• Charge

• Force

• Distance

• Mass

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