Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
History of electromagnetic theory wikipedia , lookup
Speed of gravity wikipedia , lookup
Magnetic monopole wikipedia , lookup
Fundamental interaction wikipedia , lookup
Anti-gravity wikipedia , lookup
Aharonov–Bohm effect wikipedia , lookup
Electromagnetism wikipedia , lookup
Field (physics) wikipedia , lookup
Maxwell's equations wikipedia , lookup
Lorentz force wikipedia , lookup
5 pt. 5 pt. 5 pt. 5 pt. 5 pt. 10 pt. 10 pt. 10 pt. 10 pt. 10 pt. 15 pt. 15 pt. 15 pt. 15 pt. 15 pt. 20 pt. 20 pt. 20 pt. 20 pt. 20 pt. 25 pt. 25 pt. 25 pt. 25 pt. 25 pt. 1-5 How many different kinds of electric charge are there? A) B) C) D) one two three none of these 1-5A How many different kinds of electric charge are there? B)two 1-10 is rubbed with a If a neutral glass stick neutral piece of silk, and the silk acquires a charge of -5x10-8 C, what is the charge of the glass? 1-10A is rubbed with a If a neutral glass stick neutral piece of silk, and the silk acquires a charge of -5x10-8 C, what is the charge of the glass? +5x10-8 C Why is it that a stream 1-15 of water from the faucet will attract to a positively-charged piece of plastic? A) the water molecules polarize and the -side is closer to the plastic B) the water is negatively-charged C) the water molecules polarize and the + side is closer to the plastic D) not enough info -- it is one of life’s great mysteries :) Why is it that a stream1-15A of water from the faucet will attract to a positively-charged piece of plastic? A)the water molecules polarize and the -side is closer to the plastic When the electrophorus1-20 shown below is touched with a neutrally-charged finger and then picked up the by insulating handle, what is the charge on it? + + + + + + + 1-20A When the electrophorus shown below is touched with a neutrally-charged finger and then picked up the by insulating handle, what is the charge on it? - When you ground the electrophorus, electrons move off of you onto it (they’re attracted to the positive base), thus inducing a negative charge on the electrophorus. + + + + + + + + + + + This is a 3-step process… a 1-25 neutral hanging ball, made of light-weight metal, is placed near a positivelycharged plate with someone’s hand on the other side, as shown. Draw a picture of what happens to the charge as the ball makes one back-and-forth pass between the plate and the hand. + + + + This is a 3-step process… a 1-25A neutral hanging ball, made of light-weight metal, is placed near a positivelycharged plate with someone’s hand on the other side, as shown. Draw a picture of what happens Look at the board to the charge as the ball for the answer! makes one back-and-forth pass between the plate and the hand. 2-5 According to Coulomb’s Law, two like charges _______ and two unlike charges ________. 2-5A According to Coulomb’s Law, two like charges repel and two unlike _______ charges ________. attract True 2-10 or False: When you place two charged spheres three times as far apart, the electrostatic force between them is divided by three. True2-10A or False: When you place two charged spheres three times as far apart, the electrostatic force between them is divided by three. False, it is divided by nine (inverse square law). If two equal charges2-15 (as shown in #1 below) have a force of 6 blugs between them, what will be the force between the charges in #2? #1 + #2 + + + F = 6 blugs + + + F = ? blugs If two equal charges2-15A (as shown in #1 below) have a force of 6 blugs between them, what will be the force between the charges in #2? #1 + #2 + + + F = 6 blugs + + + F = 36 blugs 2-20 2-20A Three protons form an equilateral triangle with sides of 0.07m. What is the force on an electron in the center of the triangle? Elementary Charge = 1.6x10-19 C 0 Newtons (unit required) The forces will cancel 2-25 What is the force between a +5C and a -12 C charge placed 12.4 cm apart? 2-25A What is the force between a +5C and a -12 C charge placed 12.4 cm apart? F = k q1q2 / r2 F = (9x109 N2m2/C2)(+5x10-6C)(-12x10-6C) (0.124m)2 F = 35.1 Newtons 3-5 Electric fields come out of _______ charges and go into ________ charges. 3-5A Electric fields come out of _______ positive charges and go into ________ negative charges. If the Van de Graaf generator is charged negative, 3-10 why is this woman’s hair sticking up? If the Van de Graaf generator 3-10A is charged negative, why is this woman’s hair sticking up? Because by touching the charged dome, she is acquiring the negative charge as well. Her hair follicles are all charged negative, so they repel each other and align themselves on electric-field lines. In which of the following pictures are both charges 3-15 positive? A B C D In which of the following pictures are both charges 3-15A positive? A In which of the four positions shown would the force experienced by a negative charge be the least? 3-20 1 4 3 2 In which of the four positions shown would the force experienced by a negative charge be the least? 3-20A 1 4 3 2 3-25 How does Dr. Mega-Volt survive this apparently insane ordeal? Explain in terms of electric fields. 3-25A How does Dr. Mega-Volt survive this apparently insane ordeal? Explain in terms of electric fields. The good Doctor is wearing a Faraday-cage suit, composed of metal. The electric field outside of his suit is massive, yet the field cannot penetrate to the inside, where the field is zero. So he lives to zap another day :) 4-5 How do you calculate the electric field near a point charge? 4-5A How do you calculate the electric field near a point charge? E = kQ / 2 r Which direction is4-10 the electric field at point ‘p’? P - - Which direction is4-10A the electric field at point ‘p’? P - Left 4-15 What is the electric field at point P, 2.5m from the 3μC charge? + P What is the electric field at point P, 2.5m from the 3μC charge? + E = kQ / r2 E = 9E9*3E-6 / (2.5)2 E = 4320 N/C to the RIGHT P What is the electric field at point P? Each charge has a magnitude of 2μC. There is 1m between each position below. P + - What is the electric field at point P? 4-20A Each charge has a magnitude of 2μC. There is 1m between each position below. P + - E = kQ1 / r12 – kQ2 / r22 (since opposite directions) E = 9E9*2E-6 / 22 – 9E9*2E-6 / 12 E = 13500 N/C to the LEFT 3m What is the electric field at point P? Each charge is 4μC. The distances are labeled. P + 4m + 3m What is the electric field at point P? Each charge is 4μC. The distances are labeled. P E = kQ1 / r12 E1 = 9E9*4μC / 52 E1 = 1440 N/C (at 36.9o angle: from TAN) E2 = 9E9*4μC / 32 E2 = 4000 N/C (up) Eup = 1440 sin(36.9) + 4000 = 4865 N/C Eright = 1440 cos(36.9) = 1152 N/C + 4m E = 5000 N/C at 76.7o above horizontal + 5-5 bridge to be lit What was the first using electricity? What was the first bridge to be lit using electricity? The Brooklyn Bridge 5-10 Name the actor and movie that produced this famous quote: “Heeeeeere’s Johnny!!!” 5-10A Jack Nicholson, in The Shining 5-15 The average lightning bolt could power how many homes? 5-15A The average lightning bolt could power how many homes? Approximately 200,000! (+/- 10,000) 5-20 from the ‘Mortal Name the character Kombat’ video game series famous for using lightening bolts against his opponents. 5-20Afrom the ‘Mortal Name the character Kombat’ video game series famous for using lightening bolts against his opponents. Raiden 5-25 How much power was required to operate the Flux Capacitor? Careful, SPELLING COUNTS!!! 5-25A How much power was required to operate the Flux Capacitor? Careful, SPELLING COUNTS!!! Daily Double Three protons form an equilateral triangle with sides of 0.07m. What is the force on an electron in the center of the triangle? Elementary Charge = 1.6x10-19 C