Electric and Magnetic Forces

The diagram below shows that ______________________.

• As distance increases, the electric force increases.
• As distance decreases, the objects become less attractive.
• Electric forces are only slightly affected by distance.
• As distance increases, the electric force decreases.

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NGSS.MS-PS2-3

Which answer best describes this image?

• The positive charge is repelling the negative charge.
• The blue charged object will repel the negatively red charged object.
• The positively charged red object will be attracted to the negatively charged blue object.

The Electric Force is strongest when charges are...

• close together
• far apart
• the electric force is constant everywhere

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NGSS.MS-PS2-3

The closer the charges, the ___________ the force between them

• closer
• further
• stronger
• weaker

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NGSS.MS-PS2-3

To demonstrate static electricity, a teacher takes an inflated balloon and rubs it against his hair.  The rubber balloon picks up electrons from his hair, which makes his hair have

• a net negative charge
• a magnetic force
• a net positive charge

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NGSS.MS-PS2-3

In order to create an electric charge, what type of particle must be added or removed from an object?

• proton

• electron

• neutron

• alpha particle

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NGSS.MS-PS1-1

Two small hollow metal spheres hung on insulating threads attract one another as shown. It is known that a positively charged rod will attract sphere A. Which statements can be correctly concluded about the charge on the spheres?

• A has a positive charge

• B has a negative charge

• A and B have opposite charges

• A is neutral

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Mr. Swift rubbed two balloons with a piece of wool to build a negative charge on each balloon. What will happen when the balloons are brought near each other?

• The balloons will repel each other.

• The balloons will attract each other.

• The balloons will become positively (+) charged.

• The balloons will pop.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5