Magnetic Force on moving charges Notes

Magnetic Force on moving charges

Direction

1) Thumb - direction of moving charge (Left - Right +)

3) 4 fingers - Flux Direction

4) Palm - direction of PUSH (force) on charge

Ex 1) Direction?

Left

Out of page

Force up

Force into page

Answer: Into or Out of the page?

Out of Page

Magnetic force is maximum
when charge moves
perpendicular to field

(Charge shot up)

Magnetic force = 0
when charge moves ...

... parallel to field

Force on a charge

1. F_mag = Bqvsinq

q is angle between
charge v and field

90 max, 0 degrees F = 0

B - flux density of magnetic field (strength) Teslas (T)

q - charge (C)

v - velocity (m/s)

Ex) Charge shot in field, speed and KE not changed. W=0 If perpendicular, charge will move in a circle

Bqv = mv²/r

Bq = mv/r

r = mv/Bq

Page 259) Review Book #2 - #5

2) c

3) d

4) d

5) a

Handout p. 10) 36

Enrichment

Neodymium magnet/TV

School Block YouTube? Use file below.

Warning: Doing this to your home TV
can permanently damage it!!