E/m By Millikans Oil Drop Method

Product Description

E/m by Millikan`s Oil Drop Method

Millikans oil Drop Apparatus is used to measure the Elementary Electric Charge. To achieve this, tiny charged droplets of oil are finely sprayed into two metal electrodes placed horizontally. Heavier drops tend to fall downwards fastly due to their thermal velocity but the lighter ones remain almost steady inside the metal electrode condenser chamber. An adjustable electric voltage is applied between the metal electrode plates which creates an electric field inside the condenser chamber. By adjusting the electric voltage, drops can be moved upwards or downwards according to their charge.

In the original design of Millikans oil drop apparatus, it was not easy to locate the oil drops in the condenser because the setting was critical. Therefore, keeping this thing into consideration, we made some improvements in the original design of this instrument, hence, making it user and student friendly.

With just minor settings, Millikans Oil Drop Apparatus is capable of producing bright and large number of oil drops can be seen in the condenser enabling the students to perform the experiment with great accuracy and comfort.

Technical Specifications

Stable triangular base that supports the main steel pillar on which lamp house, condenser, microscope and atomizer system is mounted.

Lamp house encloses a 12 Volt SMD LED and a condenser lens to focus the bright light on the oil drops. It can be adjusted in the horizontal plain by a slow motion screw.

Condenser plates are made of brass mounted at the top of the central pillar insulated from the rest of the apparatus. Top plate has a small hole through which sprayed oil drops enter into the condenser chamber, separated by a distance of approx 6 to 7mm. and are also provided with terminals for power supply connections.

Oil used by the automiser is Mustard Oil.

Power supply has AC 300 Volt HT and AC 10 Volts LT.

Precision Measurement for Fundamental Physics

This Millikans Oil Drop setup provides an accurate and reliable means to determine the electronic charge (e) by allowing precise manipulation and observation of oil droplets within an electric field. Designed for use in educational and research laboratories, its transparent chamber and integrated halogen lamp enhance visibility, while the calibrated micrometer and parallax-free eyepiece support high-precision readings.


Robust Design with Enhanced Safety

Built with a sturdy metal base, anti-corrosive powder-coated finish, and gold-plated electrodes, the apparatus is engineered to withstand intensive laboratory use. Safety features such as the shock-proof construction and earthed connection minimize risk, making it ideal for consistent operation in academic and research environments.


Ready-to-Use Convenience for Instructors and Students

Delivered factory-calibrated, this unit is simple to set up on any laboratory tabletop thanks to non-slip rubber feet. Key accessoriesincluding an oil atomizer, user manual, and power cordare included, ensuring the instrument is ready for immediate experimental use.