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20-8 Ampere’s Law

20-8 Ampere’s Law. * Andre Marie Ampere (1775-1836) SB||D l= m 0 I So … B(2p r )= m 0 I A solenoid is a long coil of wire with many parallel loops. Bl = m 0 NI or w/ N/l=n… B= m 0 nI See Example 20-10 pg 602. 20-8 continued (Solenoids).

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20-8 Ampere’s Law

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  1. 20-8 Ampere’s Law *Andre Marie Ampere (1775-1836) SB||D l= m0I So … B(2pr)= m0I A solenoid is a long coil of wire with many parallel loops. Bl = m0NI or w/ N/l=n… B= m0nI See Example 20-10 pg 602

  2. 20-8 continued (Solenoids) • A solenoid is a series of coils whose planes are mostly parallel and concentric. (See p 601) • Ampere’s Law gives us Bl=m0NI if we let n=N/l be the number of loops per length, then… • B=m0nI see p 601 • See Example 20-10

  3. 20-9Torque on a Current Loop • Interaction of a coil, with a current, and a magnetic field is important to many devices… Specifically motors and meters. • t= NIABsinQ See p603 • *The quantity NIA is called the magnetic dipole…. • M=NIA See Example 20-12 p604

  4. 20-10 Applications…Galvanometers, Motors, Loudspeakers • See diagrams p 604-606

  5. HW ch20TXTC • HW 20TXTC p618 36,37 41-45 due Thursday

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