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Flux =  = B • A = BA cos 

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

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Flux =  = B • A = BA cos 

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  1. Flux =  = B•A = BA cos Area vector = A is constructed normal to surface with a length = to its area πr2. A B B

  2. Flux =  = B•A = BA cos Area vector = A is constructed normal to surface with a length = to its area πr2. A B B

  3. Flux =  = B•A = BA cos Area vector = A is constructed normal to surface with a length = to its area πr2. 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 • 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. Find the direction and magnitude of the force on a 20 cm wire that carries 3 Amperes across a 4 Tesla field. • Force on a charge moving through a B field (q v x B) • Force on a wire carrying current through a B field (l ix B)

  12. B 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

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