1 / 6

# AP Unit III D - PowerPoint PPT Presentation

AP Unit III D. 2. Forces on current carrying wires in magnetic fields. Students should understand the force exerted on a current carrying wire in a magnetic field, so they can:

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'AP Unit III D' - flynn

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### AP Unit III D

2. Forces on current carrying wires in magnetic fields

• Students should understand the force exerted on a current carrying wire in a magnetic field, so they can:

• a) Calculate the magnitude and direction of the force on a straight segment of current carrying wire in a uniform magnetic field.

• b) Indicate the direction of the magnetic forces on a current carrying LOOP of wire in a magnetic field and determine how the loop will tend to rotate as a consequence of these forces.

• c) Calculate the magnitude and direction of the torque experienced by a rectangular loop of wire carrying a current in a magnetic field

x means magnetic field B going INTO paper carrying wire in a magnetic field, so they can:

. means field coming out of paper

x

x

x

e

x

x

x

- ve

+ ve

Conventional Current

Direction of force given by Fleming’s Left hand Motor Rule – thuMb – Motion, First finger – field (pointing towards south), seCond finger – current

- ve carrying wire in a magnetic field, so they can:

+ ve

Current in Rectangular Loops

-

Which way will the loop turn?

This is the motor effect.

x

x

x

x

x

x

x

x

x

Top view

+

Side view

Motor carrying wire in a magnetic field, so they can:

The force (F) on the wire is equal to the magnetic field strength B x current I x length of wire L. (F= BIL) A charge moving in a magnetic field will also undergo a force. The force F is equal to the magnetic field strength B x charge Q x velocity of charge v (F= BQv)

• What is the force on a wire of 10 meters long with a current of 2 amps in a field of 6 x 10-4 Teslas.

• What is the force on an electron in a magnetic field of 4 T traveling at 3 x 103 m/s.

• What direction will it move in.