Download presentation

Presentation is loading. Please wait.

Published byGary Wimbley Modified over 2 years ago

1
HW7 due on Friday Turn in HW6 Stand by to receive back HW5 EXAM 2 coming up on Monday !!!!! March 30 th

2
Magnetic field due to a long (straight) wire: Let’s review:

3
current on ( I up ! ).

4
Right hand rule (#1)

5
( I up/out ! ). DIRECTION-OK MAGNITUDE???

6
Experiment shows: For a long straight wire

7
Example: Suppose a cable is carrying 100 A current. What’s the B-field 1 cm from the cable? How about 10 cm?

8
Example: The cables are each carrying 25 A out the of page. What’s at point Q? 13.0 cm Q

9
Example: The cables are carrying 25 A out the of page. What’s at point P? Superposition! Next … 13.0 cm P

10
P Example: The cables are each carrying 25 A out the of page. What’s at point Q?

11
P Now: Vector Superposition! Next …

12
Example: The cables are each carrying 25 A out the of page. What’s at point Q?

13
Forces between current-carrying conductors

18
Opposite Currents Repel!

21
Parallel Currents attract! (same magnitude as other case!)

22
Example: What force per unit length do two cables 1 cm apart produce on each other? (They’re carrying 50 A each.) How about at 10 cm?

23
What about currents perpendicular to each other? …

25
Fun example: Force/m?

26
Fun example: How much current do you need in the third wire so the net forces are zero?

27
Current Loop: up/out down/in Solenoids

28
Current LoopS: up/out down/in

30
Solenoid: up/out down/in

31
WRENCH DEMO

32
Example: What’s the B-field inside a coil with 50 turns/cm, running a current of 2 A?

Similar presentations

Presentation is loading. Please wait....

OK

Chapter 30 - Magnetic Fields and Torque

Chapter 30 - Magnetic Fields and Torque

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google