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Magnetic fields, B. - Features - Force - Sources. filings. LORENTZ FORCE. A proton (q=+e) is released from rest in a uniform E and uniform B . E points up, B points into the page. Which of the paths will the proton initially follow?. C. D. A. B. E. It will remain stationary.

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Presentation Transcript
slide1

Magnetic fields, B

- Features

- Force

- Sources

slide5

A proton (q=+e) is released from rest in a uniform E and uniform B. E points up, B points into the page. Which of the paths will the proton initially follow?

C

D

A

B

E. It will remain stationary

(To think about: what happens after longer times?)

slide6

Cycloid

z

x

Source: Wofram Research, Inc.

slide7

A + charged particle moving up (speed v) enters a region with uniform B (left) and uniform E (into page). What’s the direction of Fnet on the particle, at the instant it enters the region?

To the left

Into the page

Out of the page

No net force

Not enough information

5.1

slide8
A proton (speed v) enters a region of uniform B. v makes an angle  with B. What is the subsequent path of the proton?

A) Helical

B) Straight line

C) Circular motion,  page.

(plane of circle is B)

D) Circular motion  page. (plane of circle at angle  w.r.t.B)

E) Impossible. v should always be B

5.3

slide11

A wire loop in a B field has a current I. The B-field is localized, it’s only in the hatched region, roughly zero elsewhere. Which way is I flowing to hold the mass in place?

5.4

B (into page, uniform)

L

CW

B) CCW

C) You cannot “levitate” like this!

I

m

slide12

A wire loop in a B field has a current I. The mass is "levitated" by the magnetic force Fmag=ILB. If you increase the current , does the magnetic force do positive work on the mass?

5.4

B (into page, uniform)

Yes

B) No

L

I

m