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PHY_10_34_V2_P_Charges in E.pptx
MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
10.3.1.2 – to describe the effect of the electrostatic field on a motion of a charged particle;
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Review: What is a uniform electric field?
DRAW
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Review: What is a uniform electric field?
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
When a particle of charge q and mass m is placed in an electric field E, the electric force exerted on the charge is qE.
If this is the only force exerted on the particle, it must be the net force and so must cause the particle to accelerate. In this case, Newton’s second law applied to the particle gives
𝑭 𝒆 =𝒒𝑬=𝒎𝒂
The acceleration of the particle is therefore
𝒂= 𝒒𝑬 𝒎
If E is uniform (that is, constant in magnitude and direction), then the acceleration is constant and will move in a parabola.
Motion of a charged particle in a E field
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
If the particle has a positive charge, then its acceleration is in the direction of the electric field.
If the particle has a negative charge, then its acceleration is in the direction opposite the electric field.
Motion of a charged particle in a E field
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Problem Solving
An electron is placed in an uniform electric field of 4.5x10^5N/C created by two parallel plates that are 5 cm apart. The electron accelerates from rest at the negative plate.
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
ANSWER:
(i)
(ii)
𝑭 𝒆 =𝒒𝑬=𝒆𝑬=𝟕.𝟐𝒙𝟏 𝟎 −𝟐 𝑵
(iii)
𝒂𝒂= 𝒒𝑬 𝒎 𝒒𝒒𝑬𝑬 𝒒𝑬 𝒎 𝒎𝒎 𝒒𝑬 𝒎 =7.9x10^16 m/s^2
𝒗 𝒇 𝟐 𝒗𝒗 𝒗 𝒇 𝟐 𝒇𝒇 𝒗 𝒇 𝟐 𝟐𝟐 𝒗 𝒇 𝟐 = 𝒗 𝟎 𝟐 𝒗𝒗 𝒗 𝟎 𝟐 𝟎𝟎 𝒗 𝟎 𝟐 𝟐𝟐 𝒗 𝟎 𝟐 +𝟐𝟐∙𝒂𝒂∙𝒅𝒅
𝒗 𝒇 𝟐 𝒗𝒗 𝒗 𝒇 𝟐 𝒇𝒇 𝒗 𝒇 𝟐 𝟐𝟐 𝒗 𝒇 𝟐 =𝟐𝟐∙𝒂𝒂∙𝒅𝒅=𝟖𝟖.𝟖𝟖𝟗𝟗∗ 𝟏𝟎 𝟕 𝟏𝟏𝟎𝟎 𝟏𝟎 𝟕 𝟕𝟕 𝟏𝟎 𝟕 𝒎𝒎/𝒔𝒔
𝑬= 𝒎 𝒗 𝟐 𝟐 =𝟑.𝟔𝒙 𝟏𝟎 −𝟏𝟓 𝑱
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Problem #2
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
ANSWER
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Motion of a charged particle in a E field
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Motion of a charged particle in a E field
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Motion of a charged particle in a E field
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Motion of a charged particle in a E field
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
𝒚= 𝟏 𝟐 𝒒𝑬 𝒙 𝟐 𝒎 𝒗 𝟐
This equation shows that the path followed by charged particle is parabolic in nature.
The vertical component of velocity
Net velocity of the charged particle when it just emerges from the electric field is
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
CATHODE RAY TUBE
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Label the parts of the oscilloscope
What is CRT?
For what reason an electron gun is used?
Responsibility of the vertical and horizontal plates…
How do we call the screen on which electrons gives a bright spot
Watch the video (0-1,25 min) AND ANSWER THE QUESTIONS:
https://www.youtube.com/watch?v=U1amW7S1fcI
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Label the main parts of the CRO
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
Parts of the CRO
PHY_10_34_V2_P_MOTION OF CHARGED PARTICLES IN A UNIFORM ELECTRIC FIELD
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