Investigating electric potential Essay Example for Free

Investigating electric potential Essay A graph of V against 1/d gives a straight line with positive slope from x=0. 05m. It shows that the electric potential measured by the probe is inversely proportional to the distance of the probe from the surface of the sphere. Discussion:   A voltmeter or a CRO cannot be used to measure the electric potential at a point in the air because both instruments draw a small current to produce a deflection and this will disturb the electric field.   With no flame, the probe may acquire an induced charge and thus affect the field around it, altering the potential at the needle. Therefore, a flame probe is used. It produces positive and negative ions which discharge the needle so that the needle becomes uncharged due to neutralization. Since the needle is now neutralized, its potential is the same as the original potential. Sources of error: When measuring the distance of the probe from the centre of the sphere, a piece of string with a mass attached was dropped from the sphere for locating the zero mark of the meter ruler. This may not be accurate as the sting may not be vertically below the centre of the sphere   Precautions: 1. The wire which connects the needle and the electroscope cannot touch the bench or any other earthed conductor. This is to prevent charge leakage. 2. The charged sphere must be well away from the walls and the bench top as the induced charges on these objects will upset electric field. Conclusion:   Between two parallel plates: the electric potential remains constant at constant distance from the metal plates the electric potential is proportionally to the distance from the earthed plates   Around a charged sphere: the electric potential remains constant at constant distance from the centre of sphere the electric potential is inversely proportionally to the distance from the surface of sphere

Existence Of Man :: essays research papers

Existence of Man For centuries man has grappled with the riddle of what it means to be a person. But the questions Who is man? and What is the meaning of life? are still unanswered. Yet, while man is still a long way from arriving at any acceptable definitions, there is deep within everyone the hint of an idea of what it means to be a whole person, that is happy, functioning and fulfilled. So, throughout history man has made a continuous search to find out what makes him whole. Every person is different so the special situation in which one person finds fulfillment can't work for everyone. But in the lives of those who have found fulfillment there is a universal pattern. The universal pattern is that those who have found fulfillment have had a willingness to accept change and take risks. Conversely, those who have not found wholeness are characterized by an unconquerable desire to be safe, to be out of danger and to avoid risk. The first step in the search for identity is to answer the question, How do you see yourself? In the play No Exit by Jean Paul Sartre Estelle loses sight of her identity. She says "When I can't see myself, I begin to wonder if I really and truly exist." What a man sees himself as in the mirror largely determines his actions during the day. Estelle had to look into the "mirror" of men to confirm her identity. A man is the number one determining factor in discovering who he is. Each individual must understand that he is responsible for his own pain, misery, unhappiness, or for his own joy. Man is not a product of what people have done or are now doing to us. Man has the power to become whatever he wants to be; to feel as much love or anger or joy as we want to feel. Another subsequent factor in determining our identity is the image, name, or label given to us by society. In other words, what we believe other people think of us. Most people participate in many groups friends, school, family, jobs, clubs, churches and more each contributing to our identity. We have to accept the death of the superman who is alone needing no one, inner directed and indifferent to his surroundings. We see in Dostoevsky's novel Crime and Punishment that when Raskolnkov separates himself from humanity by committing murder that he could not survive. A person needs to understand that they are responsible for their own choices but they cannot discount the fact that there

New Forest Coastline

The New Forest coastline is situated between the Dorset border and the Southampton Water on the south-west coast of Britain. It is split into three main areas and is managed mainly by the New Forest District Council but also other councils. The three areas are, Christchurch Bay, Western Solent, and Southampton Water. There is a big issue that affects this coastline. The cliffs on the coast are slowly being eroded, and the low-lying areas need to be protected from coastal flooding. Natural landscapes and wildlife habitats need to be protected for people who want to work and visit the areas. This problem attracts a lot of interest from all the councils who try and decide what system and form of protection should be used. Physical Features & Human Land-use The coastline is lined with many landforms and the land surrounding the area is used by humans for various activities. Christchurch Bay between Highcliffe and Hurst Spit has very narrow shingle beaches on its coastline and is backed by cliffs that are up to 30m in height. These cliffs are mainly made of sand and clay and are subject to erosion and in some places the cliffs have retreated up to 60m over 25 years. Even built up areas are exposed to coastal flooding and occasionally experience mudflows and landslips. Hurst Spit itself is vulnerable to the erosion of the sea after having been breached over several years. The area is used mainly for settlement and many villages have been built up along the coast all of which are in danger of flooding and/or collapsing. The Western Solent between Hurst Spit and Calshot is slightly different to Christchurch Bay. This area is full of coastal marshes with a lot of wildlife and animal habitats. This area is low-lying and therefore there is a major risk of flooding, especially when there are high tides and heavy rain. There are also two river estuaries from the Lymington River and the Beaulieu River. This area is used for boat-building and repair but also for recreational sailing. Southampton Water is situated between the towns of Calshot and Redbridge. There are coast marshes and intertidal areas with a great nature and wildlife value. The area is at risk from water pollution caused by domestic sewage and industrial waste. This former river estuary has been now developed and is used for major industry including oil refining and there is also a power station. The rest of the area is used for housing. Why we Need a Coastal Management System There is a big need for a coastal management system. Human activity has influenced the area because the scenery and recreational activities and potential attract many visitors and holiday-makers. Many other people emigrate there because it provides an attractive environment to live, work and retire. The coastline brings in more money for the locals in the form of â€Å"foreigners† and therefore without the coastline many people would have no source of income. However, human activity provides a certain amount of pressure which threatens to change the coastline and its natural ecological balance. Apart from human factors physical factors hat take place also influence the coastline's shape. Waves, Currents, groundwater, movements and weathering have a considerable impact on the shape of the coastline and human activity – this must be to be taken into account when deciding management proposals for the coast. Action taken by the Local Authority The local authority has done a lot of work involving the coastline and now must set up a management scheme to stop many risks. Over various years many protection methods have been used. Concrete sea-walls were built to protect the cliffs; however it has been proven that actually absorb the wave energy instead of reflecting it. They are also an eye-sore. Groynes have also been introduced in the system and they stop the movement of material along beaches as well as widening them. Low-lying areas have been protected by dykes and flood walls, however some people have suggested that coastal flooding should take place as a natural event even if property is at risk. There have also been attempts to protect wildlife areas and bird sanctuaries. Their Objectives The New Forest District Council have many objectives and some are more important than others, including: 1. The coast need to be protected because many properties are lined on the cliff edges and there is a big risk of them collapsing. 2. Areas of value need to be protected as they attract tourists and bring in more money for the locals and the council so they can easily afford to protect the rest of the coastline. 3. The landscape is important as it also brings in more tourists with its natural beauty of which should be protected. 4. Pollution needs to be prevented so any sort of protection doesn't become eroded by acid rain and also to improve the quality of life and the water that goes into the towns. 5. The coasts' economy needs to be recognised so it can be maintained and the social functions of the coast can take place. 6. Cooperation is important between everyone from the local councils to the industry owners. 7. Public awareness needs to be improved to let people know where they stand and what danger they are in. 8. Historical aspects needs to protected because they are an important part of history, this is not very important. 9. Developing criteria for the development of the coast is important for future vents and emergencies. 10. The least important is recreational activities as these can be done in many other places. Alternative Suggestions There are any other ways in which the coastline can be protected. On the coast many things can be used for protection. A recurved sea wall can reflect the waves and push them back out to the sea. Rip-rap are large boulders used on the coast to absorb the wave energy and disperses it. Gabions are used to absorb some of the wave energy and stop erosion as do wooden revetments. To decide what to use we would use cost-benefit analysis which would allow us to make best use of our money.

Biology Lab Essay - 9918 Words

Lab Report Answer the questions below. When you are finished, submit this assignment to your teacher by the due date for full credit. (3 points) ScoreHow do you calculate magnification on a microscope Answer Multiply the lens by the eyepiece magnification to get the total. (4 points) ScoreExplain how to focus a microscope using the high power lens. Include any safety issues you need to be aware of. Answer To focus a microscope using the high power lens, you need to carefully turn the focusing knob, and be careful of the lens so that it doesnt touch the slide. It can damage the lens, or break the slide. (1 points) ScoreWhy is it important to keep a microscope covered when youre not using it Answer It is important to keep a microscope†¦show more content†¦TiJQqzZYQnM2E-5I2YvYJf19 c1g)4b0LRFw6zp hzei--. rkIpwbcFonEZ_7(5I fGUU IXGnol8y2oz9y-Rsaz eD6py6JWuaLf9e-8 NoQe5xFFri3 y.nr1wp/qr2 .RXSq pA5JgL/0myGE r1V4Yh8gsOg,60wB7KtW n1 ,,Libbd j(IvQR7mpppOqpq PcJ,0yIVLiFYae.7AmynL),A5Z H-AJ@QnL ZUDR5smgv3W2-oR OgQSHdJm2EwxOkK,1df3SGrx2Vcy,nTn8UehbG8 qscYG2W ccuqI3LGj)rzVwp /o)XIyzT8AqhgRr/Euw tF,FqV-YSYuxv1lC0 wO9JRs0 HseMbXsGn8uc9w khQjq FsV-dJ9gYE-s zVUHy jFoKdz.Show MoreRelatedBiology Lab Report1286 Words   |  6 PagesStudy area: Present study is based on laboratory work; however the plant material for experimental purpose will be collected from experimental farm of CSIR-IIIM (32.73N and 74.87E). Objectives: 1. 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