A charged particle moves through a region of space at...

Name: A charged particle moves through a region of space at constant velocity. Ignore gravity. In the region, is it possible that there is (a) a magnetic field but no electric field? (b) an electric field but no magnetic field? (c) a magnetic field and an electric field? For each possibility, what must be true about the direction(s) of the field(s)?
Uploaded: 2022-05-10T06:11:57-08:00
Duration: 5 min 2 s
Channel: Mary Wakumoto
Description: A charged particle moves through a region of space at constant velocity. Ignore gravity. In the region, is it possible that there is (a) a magnetic field but no electric field? (b) an electric field but no magnetic field? (c) a magnetic field and an electric field? For each possibility, what must be true about the direction(s) of the field(s)?

A charged particle moves through a region of space at constant velocity. Ignore gravity. In the region, is it possible that there is (a) a magnetic field but no electric field? (b) an electric field but no magnetic field? (c) a magnetic field and an electric field? For each possibility, what must be true about the direction(s) of the field(s)?

Transcript

00:01 All right, so here we have a charge particle in red with a velocity.

00:07 And we're going to look at what happens to that charge particle and only a magnetic field, only an electric field, or both electric and magnetic field.

00:17 Because our goal would be that that velocity remains constant for our charge and basically to see if it's possible on each of these fields.

00:27 Okay, so let's take a look at only magnetic field.

00:30 So what happens with a velocity or a charge particle moving with a velocity in a magnetic field, it only feels a force if it has a component perpendicular.

00:47 So if i were to take a magnetic field that is absolutely parallel to the charged particle, then that's the only way that it will not produce.

01:02 A force.

01:03 So if i go ahead and shoot that particle exactly parallel or anti -parallel to the magnetic field, then i can have v be constant.

01:14 So yes, i can do it in a magnetic field, but i have to be parallel, exactly parallel.

01:22 The minute we have any component that's perpendicular, it starts to turn the charge.

01:27 Once you turn the charge, you change a direction and the v is not constant.

01:31 The speed might be constant, but not the v.

01:35 So you have to be exactly parallel to have that unaffected charge.

01:41 Okay, electric field, however, you're always accelerated in the direction of the electric field.

01:52 So let's say i have an electric field this way.

01:54 This before was b.

01:56 Now we've got e.

01:57 Maybe i'll change a color.

01:58 Let's change a color real quick so we can differentiate.

02:01 The two.

02:02 So let's make b field or electric field green.

02:08 Okay, so the blue was for the b field and the green then will be for the electric field.

02:15 Okay, so what happens with the electric field is no matter what, if i have a charged particle in electric field, doesn't matter if it's parallel or perpendicular.

02:26 You will always get a force on that charge in the direction of the electric field...

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