Electrostatics Review

When you brush your hair you scrape off electrons, and your hair

• becomes positively charged
• becomes negatively charged
• becomes positively and negatively charged
• remains uncharged, or neutral

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As a pair of charges is brought close together, the force between them

• Increases
• Decreases
• Increases only if they are the same sign
• Increases only if they are the opposite sign

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What method of charging is depicted here?

• Induction
• Conduction
• Reduction
• Friction

What sign are the red and blue charges, from left to right?

• Positive, positive
• Positive, negative
• Negative, positive
• Negative, negative

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A charge placed in the presence of an electric field at 1m would feel ____ at 2m.

• the same force
• double the force
• one half the force
• one quarter the force

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When a plastic rod is rubbed with wool, the wool acquires a positive charge because

• protons are transferred from the wool to the rod
• protons are transferred from the rod to the wool
• electrons are transferred from the rod to the wool
• electrons are transferred from the wool to the rod

An object with a charge of 8.1*10^-4 C creates an electric field A test charge of +1.2*10^-6 C experiences a force of 0.20 N. Calculate the electric field strength.

• 0.00405 N/C

• 246.9 N/C

• 1.6*10⁵ N/C

• 1.35*10¹⁰ N/C

Tags

NGSS.HS-PS2-4

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

• the plastic strip acquired extra protons from the cotton.
  
• the plastic strip acquired extra protons from the charging process 
• protons were created as the result of the charging process
  
• the plastic strip lost electrons to the cotton during the charging process 

A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod

• gains electrons
• loses electrons
• gains protons
• loses protons

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What method of static charging is shown in this picture

• Contact

• Friction

• Grounding

• Electron Shifting