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Millikan's Oil Drop Apparatus

Model: HO-ED-EM-01

Holmarc's Millikan oil drop apparatus (Model No: HO-ED-EM-01) is modernized version of classic set-up used to find out electron charge. The apparatus makes use of CCD camera along with computer screen for convenient viewing of oil droplet. Measurements of the droplets are also taken from display screen using a software module. Control of high voltage power supply across the electrode is made easy by having a digital display on the front panel.

The apparatus consists of two horizontal metal discs placed 10mm apart in a closed chamber. Non-volatile oils are used for the experiment. A bright LED is used for illuminating the droplets inside the chamber in order to get a clear view.

The significant difference in our setup is in the imaging system used for the observation of droplet movement. We use USB 2.0 camera which can be directly connected to the PC to monitor the droplet movement and can measure the velocity of the droplet with the help of Holmarc's dedicated software. This makes the measurements much easier and eliminates the need for conventional telescope and stopwatch system. A variable power supply of 0-2KV is used for conducting the experiment. The temperature inside the drop viewing chamber can be monitored through the front panel display system.



Experiment Examples

    To determine the charge of an electron by Millikan's Oil Drop Method

Charge of an electron can be obtained from this relation,


q   =   (  (  V2  /  V1  )  +  1  )  [ (  4  /  3  π r3  )  (  ρ  -  ρair  )  g d  ]  /  V


V1   -   Terminal Velocity

V2   -   New Terminal Velocity

r   -   Radius of the Drop

ρ   -   Density of Liquid

ρair   -   Density of Air

g   -   Acceleration due to Gravity

d   -   Distance between the Plates

V   -   potential Difference



Specification

    Power supply   :   230V AC, 50 Hz

    Power cord   :   3 core 3 pin

    Operating voltage   :   0 - 2 KV

    Video system   :   High performance CCD sensor

    Camera lens magnification   :   30 X

    Lighting   :   High bright LED lighting mechanism

    Optical power   :   1 W

    Dimension   :   590 x 490 x 760 mm


Features

    High resolution camera delivers clear view of oil droplet

    Holmarc's user friendly software helps to monitor and measure the parameters of droplet movement

    Light can be controlled to illuminate the droplets inside the chamber

    Atomizer helps to spray tiny oil droplets

Related Topics

    Electric charge

    Air buoyancy

    Air viscosity

Scope of Supply


    Oil drop Control Unit

Model No: ED-EM-01-OCU
Chamber Voltage
:
0-2 KV
Quantity
:
1 no.
Oil drop Control Unit

    Droplet Chamber

Model No: ED-EM-01-DC
Quantity
:
1 no.
Droplet Chamber

    Top Charging Plate

Model No: ED-EM-01-TCP
Material
:
Brass
Quantity
:
1 no.
Top Charging Plate

    CCD Camera

Model No: ED-EM-01-CCDC
Resolution
:
Selectable (320 - 1280 pixels)
Connectivity
:
USB 2.0
Quantity
:
1 no.
CCD Camera

    Camera Lens Assembly

Model No: ED-EM-01-CLA
Magnification
:
30 X
Quantity
:
1 no.
Camera Lens Assembly

    LED Illumination Unit

Model No: ED-EM-01-LIU
Wave length
:
589 nm
Optical power
:
Black anodized
Quantity
:
1 no.
LED Illumination Unit

    Atomizer

Model No: ED-EM-01-AM
Quantity
:
1 no.
Atomizer

    Accessories

Measuring Scale
Focusing Needle
Sample Liquid
User Manual
Netbook PC (Optional)

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