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Due Next Class: • House Project Check-In #2 Create Initial Floor Plan Draft • New Vocab (total 36) • Electric Field, E Do Now: 1. Walk in silently. 2. Grab a calculator and any papers for today. 3. 4. Put your HW on your desk ready to grade. Summarize last class in exactly 10 words. SOI : The many components of a system and their arrangement in context of the whole can dramatically change the operation of the system. By the end of the day today, IWBAT… • model the electric field using field lines and calculate the electric field strength on a test charge or charge in that field. Why it matters in LIFE: Part of being a functional human being is being able to understand what’s happening in the world around you! Why it matters in THIS CLASS: Our Goal = 80% Mastering today’s lesson (focused participation, asking questions, etc) is the first brick that will help us reach our goal for this unit, and eventually for the year TEKS: 5(C) describe and calculate how the magnitude of the electrical force between two objects depends on their charges and the distance between them By the end of today, IWBAT… •model the electric field using field lines and calculate the electric field strength on a test charge or charge in that field. Topic: Electric Fields WHAT IT MIGHT LOOK LIKE ON A TEST: Let’s demonstrate! CHARGED OBJECTS A charged object has an invisible property called “electric field” that shows the electrical force and allows it to do work on other charged objects. Because we can’t normally see it, we like to draw it so we can understand and make predictions! ELECTRIC FIELD Electric field lines are drawn based on what would happen if a positive “test” charge was placed near the charged object. ELECTRIC FIELD POSITIVELY CHARGED OBJECT If we place a positive “test” charge near a positively charged object, what will happen to the test charge? + + ELECTRIC FIELD POSITIVELY CHARGED OBJECT If we place a positive “test” charge near a positively charged object, what will happen to the test charge? + + Like charges repel! ELECTRIC FIELD POSITIVELY CHARGED OBJECT So we draw field lines radiating outward from a positively charged object. + ELECTRIC FIELD NEGATIVELY CHARGED OBJECT If we place a positive “test” charge near a negatively charged object, what will happen to the test charge? - + ELECTRIC FIELD NEGATIVELY CHARGED OBJECT If we place a positive “test” charge near a negatively charged object, what will happen to the test charge? - + Opposite charges attract! ELECTRIC FIELD NEGATIVELY CHARGED OBJECT So we draw field lines radiating toward a negatively charged object. - WHAT IT MIGHT LOOK LIKE ON A TEST: What does the electric field look like with more than one charged object? VOCAB CARDS LIGHTNING ROUND! ELECTRIC FIELD STRENGTH Just how strong is the electric field? ELECTRIC FIELD STRENGTH, E Units Newtons/Coulomb (N/C) 𝐹𝑒 𝐸= 𝑞0 Force on the test particle Charge of the test particle EXAMPLE 1 1 μC = 1 x 10 - 6 C A positive test charge of 1.0 x 10-6 C is in an electric field that exerts a force of 2.0 x 10-4 N on it. What is the magnitude of the electric field at the location of the test charge? G: Fe = 2.0 x 10 -4 q0 = 1.0 x 10 -6 U: E = ? E: E = Fe --------- q0 S: E = 200 N/C ELECTROSTATIC FORCE GUIDED PRACTICE! Complete the GP with your partner! INDEPENDENT PRACTICE! Procedure for IP time: 1) Silent work time 2) Try and solve without notes first! Hierarchy of who to ask 1) Your brain 2) Your notes 3) Ms. Kelly (after you #embracethestruggle) EXIT TICKET A positive test charge of 5.0 x 10-6 C is in an electric field that exerts a force of 2.0 x 10-4 N on it. What is the magnitude of the electric field at the location of the test charge? EXIT TICKET A positive test charge of 5.0 x 10-6 C is in an electric field that exerts a force of 2.0 x 10-4 N on it. What is the magnitude of the electric field at the location of the test charge? E = 40 N/C G: Fe = 2.0 x 10 -4 q0 = 1.0 x 10 -6 U: E = ? E: E = Fe --------- q0 S: E = 40 N/C