Physics307L:People/Joseph/Notebook/070912

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Millikan Oil Drop Experiment

Setup

We undid the previous setup (unplugged all of the cables) and started from scratch. We started by identifying that the power source-->experiment-->multimeter circuit was in parallel. Next, we plugged everything back in, leveled the apparatus, and took apart the oil drop viewing chamber. We then measured the thickness (using the micrometer)of the plastic spacer to be .759 cm. When reassembled the viewing chamber with the focusing pin in place. Plugged in light source to 12 V DC. Focused viewing reticle onto focusing pin. Adjusted the position of the light bulb to make the focusing pin the most visible. Measured the voltage and adjusted and viewed using the multimeter. Discovered temperature of lower plates by hooking multimeter up to thermistor: 25-26 Celsius (25.6).

Experiment

Initial temp: 26 celsius

Initial V: 300 V

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