1. Flux =  = B•A = BA cos
Area vector = A is constructed normal to surface with a length = to its area π r2. A B B

2. Flux =  = B•A = BA cos
Area vector = A is constructed normal to surface with a length = to its area π r2. A B B

3. Flux =  = B•A = BA cos
Area vector = A is constructed normal to surface with a length = to its area π r2. A B B

4. The AP B Ref Table writes
A loop of wire having an area of 0.25 m2 contains a magnetic field intensity of 16 Teslas as shown. Find the magnetic flux through the loop. B

5. The AP B Ref Table writes
A loop of wire having an area of 0.25 m2 has 8 Webers of magnetic flux passing through the loop. Find then strength of the magnetic field inside the loop. B

6. The E&M C Ref Tables write……..
A loop of wire having an area of 0.25 m2 has 8 Webers of magnetic flux passing through the loop. Find then strength of the magnetic field inside the loop. B

7. The AP B Ref Table writes
And E&M C says….
A loop of wire having an area of 0.25 m2 has 8 Webers of magnetic flux passing through the loop. If the field collapsed in 4 seconds……..
a) find the EMF the loop would generate.
b) tell which way current would flow
to resist the change.
c) What if there were 3 loops? B n

8. Two AP B formulas for induced E
EMF induced by the rate of change in magnetic flux
EMF induced by the speed you move a wire through a constant B field

9. Example problem: A 50 cm rod of resistance 2 ohms is moved across a 4 Tesla magnetic field at 2 m/s. Calculate…..
a)…the EMF generated.
b) …the current generated.
The direction of I is defined by the cross product E = l v x B

10. The B Ref Table says The C Ref Table says
Force on a charge moving through a B field (q v x B)
Force on a wire carrying current through a B field
(i l x B)
The C Ref Table says

11. Force on a charge moving through a B field (q v x B)
Force on a wire carrying current through a B field
(l i x B)
Find the direction and magnitude of the force on a 20 cm wire that carries 3 Amperes across a 4 Tesla field.

12. B Ref Table says C Ref Table says
As you get farther away from the wire its field gets…..
weaker
Find the strength of a magnetic field 2 mm away from a wire carrying 10 amperes of current.
C Ref Table says
and call it Ampere’s Law