(1) Let the velocity of a particle passing through the small hole Q be vx in the X axis direction at point P, vy in the Y axis direction, and T 1 in the electric field. After the particle is ejected from point P, it makes an oblique upward throwing motion, a uniform linear motion in the horizontal direction and a uniform deceleration linear motion in the vertical direction. When it reaches g, the final speed is zero.

X-axis direction: 4L=vxt 1.

Y axis direction: 2L= 12? qEmt2 1，vy=qEmt 1

Solution, t 1=2mLqE.

vx=vy=2qELm

Therefore, the velocity of the particles emitted from the particle source is V 0 = 22 Qelm.

(2) In the magnetic field, the particles make uniform circular motion with the help of the centripetal force provided by Lorenz, and draw the trajectory as shown in the figure, which is obtained from geometric knowledge.

What is its radius of motion? R=L

From qvxB=mv2xR, we get B=2mEqL.

(3) The period of particle motion in magnetic field is T=2πmqB, and the central angle of its trajectory is θ = 120+60 = 180.

Then when the particle moves in the magnetic field as T2 = 12t = π mqb = π 2, it has been praised and trampled. What is your evaluation of this answer? Comments: If your problem has not been solved, please describe your problem in detail and conduct free professional consultation through Baidu Legal Pro. Other similar questions 20 16-06-23(20 13? Jingzhou second mode) As shown in the figure, in the plane rectangular coordinate system xOy, the square area OABC with the side length of I in the I-th quadrant has 2016-10-0/(2013? As shown in the figure, in the plane rectangular coordinate system xOy, there are two parallel metal plates vertically placed in the second quadrant, and the right plate is recommended to you: F.context('cmsRight', [{'URL':'/d 01373f082025aaf51/kloc-0. x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto '，' contractId':'A24KA00562 '，}，{ ' 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 ':' '，}])； Is Huaqiang North's second-hand mobile phone reliable? 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? I recommend f.context ('recbrand', [{"img": "\/86D6277F9E2F07083523F69DFB 24B 899A901F20d? x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 450% 2Ch _ 600% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto "，" url":"/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 = 1720077498；