{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lect_15_note

Lect_15_note - Chapter 29 3 Magnetic Fields FB on a Charge...

This preview shows pages 1–12. Sign up to view the full content.

Chapter 29 - 3 Magnetic Fields

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
B Magnetic Field ± Lorenz force F = q E + q v x B
Moving Charges in a Conductor F = q E + q v x B - - - - - - - + + + + + + + E F E V H

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Moving Charges in a Conductor F = q E + q v x B + + + + + + + - - - - - - - E F E V H
Hall Effect

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Hall Effect Edwin Hall discovered this effect in 1879, while working on his doctoral thesis . American physicist 1855 to 1938
Hall Voltage - - - - + + + + E H ± The charges accumulation establish an E field which apply a force on the moving charges against the magnetic force. ± The charge accumulation stops until F B =F E . Then charges move straightly. ± F = q E + q v x B So, E H =v d F E

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Hall Effect - - - - + + + + E H ± While charges accumulate at the two sides, a potential difference is generated in a direction perpendicular to both the current and the magnetic field ± V H = E H d F E V H
Hall Voltage - - - - + + + + E H F E ± When E H =v d B ± The potential difference between the up and the bottom edges V H = E H d = v d B d ± I = Δ Q / Δ t = nqv d A = nqv d td ± v d d = I / ( nqt ) H H I I BRB V nqt t ∆= =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Hall Voltage R H = 1 / nq is called the Hall coefficient H H II BRB V nqt t ∆= =
Application of Hall Effect ± The Hall effect gives information regarding the sign of the charge carriers and their density R H = 1 / nq ± It can also be used to measure magnetic fields B = V H t / (R H Ι )

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 33

Lect_15_note - Chapter 29 3 Magnetic Fields FB on a Charge...

This preview shows document pages 1 - 12. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online