W14 Activity 3 - Intro. to Electric Fields

W14 Activity 3

Intro. to Electric Fields

By Nicholas Carrillo

How do electric charges 'talk' to each other?

Same charges repel and opposite charges attract.

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But how do they interact with one another without touching?

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Michael Faraday came up with the idea of an Electric Field

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Charges create Electric fields which surround them in all directions, and stretch out forever.

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The electric field is not an electric force.

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The electric field causes a force to act on a charge.​

Subject | Subject

Multiple Choice

True of False: The electric field is a force

• True

• False

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​The electric field from one charge causes a force on another charge.

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The other charge ALSO has an electric field, which causes a force on the original charge. This is how they inertact!

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The electric force on a charge is determined by the strength of the electric field at the location of the charge.

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Doesn't need to 'know' about the other charge, just the field.

Multiple Choice

True or False: A charge inside of an electric field also produces its own electric field.

• True

• False

Multiple Choice

Pick the best explanation.

How much electric force a charge experiences in an electric field is based on...

• ...the strength of the Electric field the charge experiences

• ...the amount of charge that causes the electric field.

• ...what type of electric charge that produces the field.

The force a charge experiences in an Electric field is the Strength of the Electric field, multiplied by the amount of charge.

​F_E = qE

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Units for E are N/C​

A charge of 5C is placed in an electric field with strength 20N/C. What is the magnitude of the force acting on the charge?

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F_E = qE = 5*20 = 100N​

Subject | Subject

Some text here about the topic of discussion

Continue working on activity on your own or with your neighbors.

Multiple Choice

The electric field lines for a single positive charge point radially (like a circle)....

• Inward

• Outward

Multiple Choice

The electric field lines for a single negative charge point radially (like a circle)...

• Inward

• Outward

Multiple Choice

Q_A and Q_B are two charges creating an electric field. Based on the electric field lines, we can conclude that _____________.

• Q_A and Q_B are both positive

• Q_A and Q_B are both negative

• Q_A is positive and Q_B is negative

• Q_A is negative and Q_B is positive

Multiple Choice

At which point is the electric field the strongest

• A

• B

• C

• D

Multiple Choice

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

• + , +

• + , -

• - , +

• - , -

Multiple Choice

Consider the electric field lines drawn at the right for a configuration of two charges. Several locations are labeled on the diagram. Which of these shows the ranking in order of weakest to strongest correctly

• A, E, C
• D, E, C
• D, B, A
• A, D, B

Multiple Choice

Which of the following is a true statement about the electric field between the two plates?

• The field is attractive between the plates and uniform in strength

• The field is repulsive between the plates and uniform in strength

• The field is attractive between the plates and strongest near the positive

• The field is repulsive between the plates and strongest near the positive

Multiple Choice

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

Multiple Choice

Which diagram represents the electric fields of a negative point charge, shown by º

Multiple Choice

which is the field for opposite charges