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Phys 133 -- Chapter 331 Chapter 33 Electromagnetic Induction.

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Presentation on theme: "Phys 133 -- Chapter 331 Chapter 33 Electromagnetic Induction."— Presentation transcript:

1 Phys Chapter 331 Chapter 33 Electromagnetic Induction

2 Phys Chapter 332 Demo Faraday

3 Phys Chapter 333 Some experiments

4 Phys Chapter 334 Motional emf

5 Phys Chapter 335 Motional emf (cont.) Reach equilibrium

6 Phys Chapter 336 A potential difference of V is developed across a 10-cm long wire as it moves through a magnetic field at 5.0 m/s. The magnetic field is perpendicular to the wire axis. What are strength and direction of field? Problem 33.1

7 Phys Chapter 337 Problem 33.1 (ans) At equilibrium FeFe FmFm Out of page

8 Phys Chapter moving charges in B field, force --> current --current-carrying wire in field, force Induced current

9 Phys Chapter 339 Do workbook 33.1

10 Phys Chapter 3310 Eddy currents

11 Phys Chapter 3311 Do workbook 33.2 & 4

12 Phys Chapter 3312 Eddy currents (cont.)

13 Phys Chapter 3313 Demo eddy currents

14 Phys Chapter 3314 Do workbook 33.5 & & 7

15 Phys Chapter 3315 Magnetic flux

16 Phys Chapter 3316 Do workbook 33.9 & 11

17 Phys Chapter 3317 There is an induced current in a closed, conducting loop if and only if the magnetic flux through the loop is changing. The induced current creates an induced magnetic field which opposes the change in flux. --changing flux produces induced current --induced current creates induced field --induced field opposes the change Lenz’s law

18 Phys Chapter 3318 Do workbook 33.12, 13 & 19

19 Phys Chapter 3319 The current in the solenoid is decreasing. The solenoid is surrounded by a conducting loop. Is there a current in the loop? If so, is the current in the loop cw or ccw? Problem 33.9

20 Phys Chapter 3320 Problem 33.9 (ans) B1B1 Initially later  B2B2    ∆∆ Change in flux to left Find change in flux Find induced field Induced field points to right Find induced current Induced current is clockwise from behind

21 Phys Chapter 3321 field is there independent of wire Induced fields

22 Phys Chapter law of nature --usually helpful Faraday’s law -field can change -area can change -both can change

23 Phys Chapter 3323 Do workbook 33.21

24 Phys Chapter 3324 Problem 33.12b The loop is being pushed out of the 0.20 T magnetic field at 50 m/s. The resistance of the loop is 0.20 . What are the direction and magnitude of current in the loop?

25 Phys Chapter 3325 Problem 33.12b (ans) L w Counter-clockwise

26 Phys Chapter 3326 Two 20-turn coils are tightly wrapped on the same 2.0-cm-diameter cylinder with 1.0-mm-diameter wire. The current through coil 1 is shown. A positive current is into the page at the top of the loop. Determine the current in coil 2 as current vs. time t = 0 s to 0.4 s. (Assume field of coil 1 passes completely through coil Problem 33.35

27 Phys Chapter 3327 Problem (ans) B1B1 (+) 22 I1I1 d  2 /dt 22 I2I2

28 Phys Chapter 3328 Problem (ans) (+) I1I1 I2I2 Right to left through resistor

29 Phys Chapter 3329 Generator

30 Phys Chapter 3330 Transformer

31 Phys Chapter 3331 Coulomb and non-Coulomb electric fields

32 Phys Chapter symmetric in E and B Maxwell and induced magnetic field

33 Phys Chapter 3333 E & M equations

34 Phys Chapter 3334 Maxwell’s equations

35 Phys Chapter math Light is an E&M wave!!! Maxwell-no charges or current

36 Phys Chapter 3336 EM waves

37 Phys Chapter 3337 Problem A U-shaped conducting rail that is oriented vertically in a horizontal magnetic field. The rail has no electrical resistance and does not move. A slide wire with mass m and resistance R can slide up and down without friction while maintaining electrical contact with the rail. The slide wire is release from rest. a)Describe the motion of the slide wire. b)Find the terminal velocity of the slide wire


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