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Section 2: Magnetic Induction

Section 2: Magnetic Induction. Magnetic Field Around a Wire Right Hand Rule: Current is in the direction of positive charge flow. Magnetic Fields around Paired Wires. Magnetic Field in a Loop:. Magnetic Field in Solenoid. Electro Magnet. How it works: What makes a strong electromagnet:

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Section 2: Magnetic Induction

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  1. Section 2: Magnetic Induction

  2. Magnetic Field Around a Wire Right Hand Rule: Current is in the direction of positive charge flow

  3. Magnetic Fields around Paired Wires

  4. Magnetic Field in a Loop:

  5. Magnetic Field in Solenoid

  6. Electro Magnet How it works: What makes a strong electromagnet: 1) 2) 3)

  7. Forces on charges: To find the force: • Fingers go in the direction of the field • Thumb goes in the direction of the charge • Palm goes in the direction of force of a (+) charge and opposite for (-) charge.

  8. Force, Current, and Magnetic Fields Force on a positive charged particle moving through a magnetic field: F = BqV Sample Problem: Find the force and direction on a 2C positive charge that is in a 3 T (Tesla) magnetic field and traveling with a velocity of .5m/s

  9. Force on a wire with current in a magnetic field: F = BIL Sample Problem: Find the force on the 1.5 meter wire that has 2 amps of current passing through it when placed in a 10 T (Tesla) magnetic field.

  10. Electromagnetic Induction: When current is created in a conductor using a changing magnetic field Factors that affect magnetic induction: 1) 2)

  11. Lenz’s Law: The direction of the magnetic field of an induced current oppose the magnetic field that created it.

  12. Faraday’s Law for creating current: Voltage = -NA(ΔB/Δt) Sample Problem: Find the voltage produced when a coil of wire with 5 turns and a cross section of .002m2 feels a magnetic field change of .4T/s.

  13. Practice Problems A 52 turn coil with an area of .0055m2 is dropped from a position where the magnetic field strength is zero to a position where the field strength is .55T which occurs in .25s. Find the average emf (induced voltage).

  14. Building an Electric Motor

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