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...

20-8 Ampere’s Law *Andre Marie Ampere (1775-1836) SB||D l= m 0 I So … B(2pr)= 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

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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

Page 2: 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 =

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

Page 3: 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 =

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= NIABsin Q See p603

*The quantity NIA is called the magnetic dipole….

M=NIA See Example 20-12 p604

Page 4: 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 =

20-10 Applications…Galvanometers, Motors, Loudspeakers

• See diagrams p 604-606

Page 5: 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 =

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