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lecture12

# Fundamentals of Physics, (Chapters 21- 44) (Volume 2)

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hapter 29: Magnetic Fields due to Curren Solenoids Getting vector B of a Solenoid Toroids Torque in an Electric Field Torque in an Magnetic Field A Current Carrying Coil Checkpoint #4 Problems Faraday’s Law Chapter 29: Magnetic Fields due to Currents – p.

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Solenoids A solenoid is a conducting wire wrapped into a cylindrical shape. It acts like a capacitor for magnetic fields. Inside: vector B is constant Outside: vector B is virtually zero Chapter 29: Magnetic Fields due to Currents – p.
Getting vector B of a Solenoid To find vector B , we use Ampere’s Law and treat the solenoid like two lines of current-carrying wires. In the middle, vector B = μ 0 in where i is the current going through the solenoid, and n is the number of turns in the solenoid. Chapter 29: Magnetic Fields due to Currents – p.

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Toroids A toroid is a solenoid that has been curved until its ends meet (a current doughnut). vector B is trapped within the toroid. We apply Ampere’s Law again in this case: B · 2 πr = μ 0 iN ( N is the number of turns) B = μ 0 iN 2 πr Chapter 29: Magnetic Fields due to Currents – p.
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