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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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A force is applied to a book (2.5kg) at an angle of 30 degrees to the x-axis. What is the range of forces that need be applied in order for the book to remain motionless? (neither moving up nor down.)
(Photos by Karl Weisel)
A local U.S. military dentist and championship yo-yo artist shares his artistry with Hainerberg Elementary School students Jan. 15.
(To download and save an image, click on a photo, then the Actions drop down menu, View all sizes and then Download the large size of the photo.)
Among the devices used in Buffalo State's Physics Lab Immersion workshop was this one, which is superconducting SQUID equipment for measuring the superconducting transition temperature. "SQUID" stands for superconducting quantum interference device.
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.
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Institute of Physics Ireland Top Students Awards 2019
Dr. Yvonne Kavanagh, Chair of the Institute of Physics Ireland, this evening presented Silver Medals to the top Leaving Certificate physics students and the Earnshaw Award for the best physics final year undergraduate project in Ireland. The event in the RDS was attended by friends and members of IOP Ireland together with the students, their families and teachers.
Pictured: Dr.Yvonne Kavanagh, Chair of the Institute of Physics Ireland presented Leaving Certificate Silver Medals to L-R
Cathal O’Rourke, Patrician High School, Carrickmacross, Co. Monaghan
Cathal is currently studying Economics and Finance in University College Dublin, Seán Thompson, Coláiste Choilm, Ballincollig, Co. Cork
Seán is currently studying Mechanical Engineering in the University of Edinburgh and Cathal Tuohy, Clongowes Wood College, Clane, Co. Kildare
Cathal recently received the UCD Entrance Scholars Award for his academic high achievements in the Leaving Certificate and is currently undertaking his Bachelor of Engineering studies in University College Dublin.
Photograph: Bryan Brophy / 1IMAGE Photography
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Raising a Glass
The bottom of this glass acts as a concave diverging lens when used to view an object. In this photo, the object is a hand which is held approximately six inches above the bottom of the glass yet the hand appears much farther away than 6 inches. Concave diverging lenses have the same characteristics no matter how far the object is away from the lens: the image is always virtual, upright, and de-magnified. The hand is de-magnified by the lens-like-properties of the glass. The lens distorts the image because the light rays that pass through the lens are brought to a focus in front of the lens instead of behind is where the image is actually located.