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Tiffany Luu | Photographer

This set-up was used to show that a rotating magnetic field induces currents in a conductor so that the conductor will rotate.

1)Name the Physical quantities to be kept constant for Ohm’s law to be true.

2)State the Principle of a potentiometer. (The students say that potential drop is proportional to length but the constant quantities are not mentioned)

3)How can we increase the sensitivity of a potentiometer?

4)Define figure of merit of a galvanometer. Which has more resistance – a galvanometer or a milliammeter?

5)How does an LED emit light?

6)What is the difference between an ordinary diode and an LED?

7)Define principal axis of a convex lens? What happens to the focal length of a concave mirror if it is immersed in water?

8)What are the factors affecting the intrernal resistance of a cell? What are the difference between primary and secondary cell?

9)Why can’t we use a dry cell for starting a car? Hints/Answers length, area of cross section,temperature

Ans)

The potential drop across any length of a conductor of uniform cross section and composition carrying a constant current is directly proportional to the length. increasing the length of potentiometer wire, decreasing the current, decreasing the potential gradient

Current for unit deflection galvanometer The energy released during recombination of electrons and holes across the junction is responsible for the release of light by LED In ordinary diode the energy emitted during recombination of electrons and holes is in the invisible region of the em spectrum but in the case of LED, the energy is in the visible region. Straight line joining the centres of curvature of the lens.. The focal length of mirror does not change by changing the medium. Their is a pure geometrical relationship between the radius of curvature and focal length and the relation does not include any term depending on refractive index. the nature of electrolyte, the concentration of electrolyte, temperature, distance between electrodes, area of electrodes Primary cell cannot be recharged, secondary cells can be recharged; secondary cells have less internal resistance than primary cells. Due to the high internal resistance of a dry cell, it won’t be able to provide the current sufficient to start the car.

  

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"Recent Discoveries in Fundamental Physics: Solar Neutrinos, Higgs Boson, and Gravitational Waves"

 

Mark Neubauer

Physics Department,

University of Illinois, Urbana-Champaign

 

This talk will focus on recent discoveries at both the very small and very large distance scales and their implications for fundamental physics. Prospects for future discoveries and some tantalizing hints of new physics will also be discussed.

The new physics building at Rice University is a magnificent piece of modern architecture, but you really need to see it for yourself to appreciate the quality and texture of the materials, not to mention the beautiful landscaping.

Principles of Liquid Nitrogen.

Tiffany Luu | Photographer

Calibrating the tone arm on the record player. Screwing the weight closer to or further away from the fulcrum allows us to counterbalance the needle cartridge and set the tracking weight.

Graphics by NetKismet Web Services for NetKismet Physics (at physics.netkismet.com)

Darius Gales `12 and Nautica Bigsby `12 working on a physics lab experiment.

Ecole St. Patrick's physics teacher Thana Rahim (right) soaks up the fun with the school's science volunteers.

Meissner effect in action

Congresswoman Jennifer McClellan, left, Congresswoman Jen Kiggans, center, and Director Stuart Henderson, right, chat during a visit atJefferson Lab in Newport News, Va., on Tuesday, May 2, 2023. (Aileen Devlin | Jefferson Lab)

Duke University Physics Department holiday party, December 13, 2013.

Independent Music Seminar in San Diego

Tiffany Luu | Photographer

Tiffany Luu | Photographer

The lower proton is wearing pillows in addition to the helmet.

Duke University Physics Department holiday party, December 13, 2013.

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