Guiyang v2 photography

(1) Let the time for particles to move to point Q be t, and the speed along the electric field at point Q be vy. According to the fractional motion formula similar to flat throwing motion, there are:

233h=v0t

h=vy2t

Solution: vy=3v0.

The speed at which particles enter the magnetic field is v.

v=v20+v2y=2v0

When the particles enter the magnetic field, the included angle with the X axis is θ, including:

Tanθ=vyv0=3, so θ = 60;

Let the radius of uniform circular motion of particles after entering the magnetic field be r, and according to Newton's second law, there are:

qvB=mv2r

Solution: r=2mv0qB

The minimum width of the strip-shaped magnetic field region satisfying the conditions is d0, and it can be known from the geometric relationship that:

d0=rcosθ+r

Solution: d0=3mv0qB

(2) If particles can enter the magnetic field region III and the strip magnetic field region is d 1, then:

2d 1: 20 10-08-20 As shown in the figure, there are horizontal and right uniform electric fields in the xOy plane, as shown in the figure, in the first quadrant of the xoy coordinate plane (582016-12-01). In the vertical X-Y coordinate system, there is a bounded horizontal and rightward uniform electric field above the X-axis, with a field strength of E, and there is a12014-1-30 below the X-axis. As shown in Figure A, in the xOy coordinate system, there is a uniform electric field with a field strength of E along the positive direction of the X-axis. There is a uniform electric field parallel to the Y axis in the xoy plane, and the circle 4 with the radius of r: F recommends the context for you ('cmsright', [{'URL':'/activity/knowledge? page key = l 6 ppxszt- 1 & CD version = 0. 1. 18 '，' src ':'/b 80 14 a90f 603738 db 886 dab fa 1 1bb 05 1f 9 19 ec5b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}，{ ' URL ':/s？ word = % E6 % AC % A7 % E6 % B4 % B2 % E6 % 9D % AF & sa = searchpromo _ ozb _ zhidao _ tuijian '，' src ':'/3 BF 33 a 87 e 950352 AAF 5 df 4954 143 fbf2b 2 1 18 b6b？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId ':' '，}])； Why is the cost of cancer treatment getting higher and higher? What impact will the "network toilet" have? The price of electric cars has dropped many times. Is the quality guaranteed? Is Huaqiang North's second-hand mobile phone reliable? Baidu legal pro-free legal service recommends super 3w professional lawyers, 24-hour online service, with an average of 3 minutes to reply to free appointments. Online lawyers guide professional lawyers to complete one-on-one communication at any time, waiting for your answer? Change and help more people? Download Baidu Know APP and grab a fresh experience. Know the APP with Baidu and grab a fresh experience immediately. There may be answers that others want to know in the camera of your mobile phone. Scan QR code to download illegal and harmful information about personal and corporate infringement complaints. Please select and submit a category below.

Pornography, vulgarity, suspected crimes, false political information, junk advertisements, and low-quality irrigation. We will inform you of the report results as soon as possible through news and e-mail.

explain

0/200

Submit to cancel the collection of my wealth value.

Exchange goods-

Log in to my cash.

Withdraw cash to download Baidu know APP

Withdraw cash in the application task center

I see.

-

Log in to do the task, open the treasure chest, and finish it cumulatively.

0 tasks

10 task

slightly ...

50 tasks

slightly ...

100 task

slightly ...

200 task

slightly ...

The task list is being loaded ... novices help me answer questions, be adopted, introduce the game with wealth values, and know that the mall helps group partners to verify that your account status is normal.

Thanks for your support.

Complaints, suggestions, opinions, feedback, account complaints, illegal information reporting, Beijing ICP certificate 030 173-1? Text 2023 1034-029? Must read before using Baidu in 2024? Know the agreement |? Enterprise promotion

Suksuke

way

var _ HMT = _ HMT | |[]； (function(){ var hm = document . createelement(" script ")； hm.src = "/hm.js？ 6859 ce 5a af 00 FB 00387 e 6434 E4 FCC 925 "； var s = document . getelementsbytagname(" script ")[0]； s.parentNode.insertBefore(hm，s)； })(); window . TT = 17 18838785；