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Drawing device with functions of set square, compasses and protractor

A drawing tool and technology of concentric circles, applied in the field of drawing tools, can solve problems such as unsatisfactory problem-solving effects and high difficulty for students, and achieve the effects of simple and reasonable structure, improved efficiency, and convenient use

Inactive Publication Date: 2013-05-01
李伯谦
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In senior high school physics, there is a kind of problem of deflecting charged particles in a magnetic field. To solve this kind of problem, it is often necessary to use a compass and a ruler to cooperate with the drawing. Students feel that it is difficult and the problem-solving effect is not ideal.

Method used

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  • Drawing device with functions of set square, compasses and protractor
  • Drawing device with functions of set square, compasses and protractor
  • Drawing device with functions of set square, compasses and protractor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (2009 Fujian Volume 22) image 3 It is a simplified schematic diagram of a certain device that can measure the specific charge. In the first quadrant area, there is a uniform magnetic field perpendicular to the surface of the paper, the magnetic induction intensity is B=2.0×10-3T, and the distance from the coordinate origin on the x-axis is L=0.50 P at m is the incident port of ions, and a receiver is placed on y. Now the positively charged particle is v=3.5×10 4 The rate of m / s is injected into the magnetic field from P. If the particle is observed at M on the y-axis at a distance of L=0.50m from the origin of coordinates, and the radius of the trajectory is just the smallest, let the mass of the charged particle be m and the electric quantity be q , regardless of its gravity. (1) Calculate the specific charge of the above particles (2) If a uniform electric field is added in the first quadrant at a certain moment during the movement of the above particle, it can m...

Embodiment 2

[0047] (2011 Guangdong 35 questions) such as Figure 5 As shown in (a), with O as the center, the inner and outer radii are R 1 and R 2 In the ring area of ​​, there is a radial electric field and a uniform magnetic field perpendicular to the paper surface, the potential difference U between the inner and outer circles is constant, and R 1 = R 0 , R 2 = 3R 0 , a particle with a charge of +q and a mass of m enters the area from point A on the inner circle, regardless of gravity.

[0048] (1) It is known that the particle travels from the outer circle with a velocity v 1 Eject, find the initial velocity v of the particle at point A 0 the size of

[0049] (2) If the electric field is removed, such as Figure 5 (b), it is known that the particle travels from the intersection C of the extension line of OA and the outer circle with a velocity v 2 Injection, the direction is at an angle of 45° to the OA extension line, find the magnitude of the magnetic induction and the ti...

Embodiment 3

[0069] (2009 Zhejiang 25 questions) such as Figure 8 As shown, the positive direction of the x-axis is horizontal to the right, and the positive direction of the y-axis is vertically upward. There is a uniform electric field parallel to the y-axis in the xOy plane, and a uniform magnetic field perpendicular to the xOy plane in a circle with a radius R. A charged particle emitting device is placed on the left side of the circle, which emits a beam of charged particles with the same mass m, charge q (q>0) and initial velocity v along the positive direction of the x-axis. When launching, this beam of charged particles is distributed in the interval of 0<y<2R. The acceleration due to gravity is known to be g. (1) The charged particles ejected from point A enter the area with magnetic field from point C parallel to the x-axis, and leave from the coordinate origin O along the negative direction of the y-axis, find the magnitude and direction of the electric field intensity and ma...

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Abstract

The invention discloses a drawing tool. The problem of deflection of a class of charged particles in a magnetic field in high-school physics exists, compasses and a ruler need to be used frequently for matching to carry out construction for solving this class of problem, students feel comparatively difficult, and the problem solving effect is not ideal. In order to overcome the defect of the method, the invention provides a simple, convenient and practical drawing tool with high efficiency. The drawing tool comprises two parts which are a left upright part and a right part, wherein millimeter scales are arranged on the left upright part, and the left upright part is provided with signs. The right (left) part is a group of concentric circles. The center of the circle is provided with a small hole of which the diameter is 1mm. The trajectory of the movement of charged particles is represented by an inner side circle and an outer side circle. Small half circles at both sides of sawteeth of a transverse beam of the concentric circles are the starting point of the trajectory. Angle values are engraved on the concentric circles.

Description

technical field [0001] The invention relates to the field of teaching and is a drawing tool. Background technique [0002] In senior high school physics, there is a kind of problem of deflecting charged particles in a magnetic field. To solve this kind of problem, it is often necessary to use compasses and rulers to cooperate with drawing. Students feel that it is difficult and the problem-solving effect is not ideal. Contents of the invention [0003] In order to overcome the shortcomings of the above methods, the present invention provides a simple, practical and efficient drawing tool. The technical solution adopted in the present invention is: the invention is made of two parts, the left (right) vertical part has scales and signs on it, which respectively represent the direction of positive and negative charge movement and the direction of the magnetic field. Concentric circles, the center of which is a small hole with a diameter of 1mm, the radius of the inner circle...

Claims

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Application Information

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IPC IPC(8): B43L13/00
Inventor 李伯谦
Owner 李伯谦
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