6.13

6.13 starter

Practical - the current balance
· Use a current balance to investigate what happens when a current flows in a magnetic field
· How many magnetic fields are created by this apparatus?
· How could you make the wire move further? (2 ways)
· How could you change the direction the wire moves in? (2 ways)

Answers
1. 2 magnetic fields:
a. the uniform magnetic field created between the poles of the permanent magnet
b. the magnetic field around the wire when the current flows
2.
a. Increase the current in the wire
b. Increase the strength of the magnetic field
3.
a. Reverse the poles of the magnets
b. Reverse the direction of the current

6.13

· 6.13 use the left hand rule to predict the direction of the resulting force when a wire carries a current perpendicular to a magnetic field

6.13 FLHR simulation

Website:

http://www.walter-fendt.de/ph14e/lorentzforce.htm

Example:

http://maddog11physics.posterous.com/68-field-around-current-carrying-conduct...

6.13 Plenary

Magnetic fields interacting - Force on current carrying wire.swf Download this file

FLHR practice.pptm Download this file

FLHR Animation - Force on current carrying wire.swf Download this file

6.8 to 6.10 Plenary

6.8 to 6.10 Plenary answers

See the full gallery on Posterous

6.10

6.10

01 December 2011

18:04
· 6.10 sketch and recognise magnetic field patterns for a straight wire, a flat circular coil and a solenoid when each is carrying a current

Straight wire = Right hand grip rule

Flat circular coil

Solenoid

6.8 to 6.10 Plenary questions

6.8 and 6.9 starter

6.8 and 6.9 starter

Tell the person next to you…
· What's an electromagnet?
· How is it different from a magnet?

6.8 Field around current carrying conductor simulation

Website:

http://www.walter-fendt.de/ph14e/mfwire.htm

6.8 and 6.9

· 6.8 recall that an electric current in a conductor produces a magnetic field round it
· 6.9 describe the construction of electromagnets

6.8 and 6.9 extension - bell

6.8 and 6.9 Plenary Multichoice questions

magnetic field around wire and a solenoid.swf Download this file

Electromagnets.ppt Download this file

Electromagnet lifting a car.swf Download this file

electric bell animation.SWF Download this file

6c Plenary Multichoice questions.pptx Download this file

Topic 6 Keywords

Unit 6 Keywords and Mixed Definitions.doc Download this file

6.7

6.7 starter

Tell the person next to you…
1. If the field lines are close together, what does this tell you about the field?
2. If the field lines are widely spaced, what does this tell you about the field?
3. If the magnetic field lines are parallel to each other, what does this tell you about the field?

Answers
1. The field is strong
2. The field is weak
3. The field is of a constant strength - a "uniform" field

6.7

· 6.7 know how to use two permanent magnets to produce a uniform magnetic field pattern

· When the field lines are parallel, the field will be uniform (constant field strength)

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6.6

6.6

· 6.6 sketch and recognise the magnetic field pattern for a permanent bar magnet and that between two bar magnets