Announcements New Voltage video is posted due Monday (electric field video is due at midnight tonight) Extra credit opportunity: Kaiying’s Coca Cola Clean.

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Announcements New Voltage video is posted due Monday (electric field video is due at midnight tonight) Extra credit opportunity: Kaiying’s Coca Cola Clean Water Project Link on class website - Points go toward quiz of your choice After you vote or get someone to vote, email me a screenshot as proof to rpaguay@schools.nyc.gov Include time stamp in screenshot

How do electrons know what to do? 4.1.4 Electric Fields

- + Electric Field Maps Electric fields… exist near CHARGED OBJECTS mapped using a POSITIVE test charge 1 – place test charge 2 – draw arrow in direction pushed 3 – this is the field direction + - + +

Electric Field Maps + -

Electric Field Maps + +

Electric Field Strength Gets WEAKER with distance FORCE exerted per unit CHARGE E r + A B C A > C > B

Example #1 An object with a charge of -2 coulombs positioned in a uniform electric field experiences a force of -300 newtons. What is the strength of the electric field? E= Fe/q E = -300 N / -2 C E = 150 N/C

Example #2 What is the force experienced by a 0.05 coulomb charge when it is placed in an electric field with a strength of 3 x 103 newtons per coulomb? Fe = Eq F = (3 x 103 N/C)(0.05 C) F = 150 N

Parallel Plates + + + + + + + + + + - - - - - - - - - - - - Field strength… Between plates E  Fe = SAME AT ALL POINTS Outside plates = ZERO + + + + + + + + + + - - - - - - - - - - - -