Electrostatics

A Van de Graaff generator can be used to create a large amount of

• current

• electrical resistance
  

• static charge

• mixed positive and negative charges on its surface

Why did the girl's hair stand on end when the girl was touched the dome of Van de Graaff?

• The positively charged (+) hair was repulsed by the positive charged (+) girl and each other.

• The positively charged (+) hair was repulsed by the negatively charged (-) girl and each other.

• The negatively charged (-) hair was repulsed by the negatively charged (-) girl and each other.

• The negatively charged (-) hair was repulsed by the positively charged (+) girl and each other.

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Find the magnitude of the force between two charges of 1.0 C each which are 1.0 meter apart?

• 9E-9 N

• 9E9 N

• 1.1E10 N

• 1.1E-10 N

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What happens to the force between two charged objects when you halve the distance between them?

• 2X

• 1/2X

• 4X

• 1/4X

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

• decreases;directly

• decreases;inversely

• increases;inversely

• increases;directly

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The Electric Force is strongest when charges are...

• close together

• far apart

• the electric force is constant everywhere

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If two equal charges each of 1 C each are separated in air by a distance of 1 km, what is the magnitude of the force acting between them?

• 1 N

• 9 x 10⁹ N

• 9 x 10³ N

• 9 x 10⁶ N

• 1 x 10² N

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The charge of an electron is

• positive

• negative

• neutral

The SI unit of charge is _______ and it is a _______ quantity.

• ampere, scalar

• coulomb, vector

• coulomb, scalar

• joule, vector

Electric charges that are similar _______ each other.

• Attract

• Repel

• Static

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