Electric Field intensity due to surface and volume charge density

-

In this video, electric field intensity due to infinite surface charge density is derived. Also the total charge due to volume charge density is calculated.







Comments

Post a Comment

Popular posts from this blog

Spotters in "Environment and Health: Mosquito control Measures" for CFM & MPH students

-
Image
The integrated approach of mosquito control: This is an approach that avoids the excessive use of any one method (e.g insecticides) but tries to combine one or more methods with a view to obtain maximum results with minimum inputs and also to prevent environmental pollution with toxic chemicals & development of insecticide resistance. The various methods of mosquito control are as follows: 1. Anti- Larval Measures: (a) Environmental Control: Important Points: Source reduction : Mainly the elimination of mosquito breeding places by minor engineering methods such as  Filling- of cesspools & open ditches and arrangement for adequate collection, removal, and disposal of sewage & wastewater. Leveling & getting rid of water-holding containers such as discarded tins, empty pots, broken bottles, coconut shells, etc. Drainage of breeding places, and  Water management (e.g intermittent irrigation) & removal of aquatic plants or destruction by herbicides. Rendering th...
Read more

Spotters in "Hospital Waste Management" for CFM & MPH students

-
Image
 As per “Bio-medical Waste Management Rules, 2016”  1. Yellow Bin/ Bag: Type of Bag/  Container used:  Non-chlorinated  plastic bags Type of Waste:  1. Human Anatomical Waste A. Tissues, organs, body parts B. Foetus, Umbilical stump, placenta 2. Animal Anatomical Waste:  Tissues, Organs, body parts 3. Soiled Waste:  items contaminated with blood and body fluids A. Dressings, sponges, gauze B. Plaster casts C. Cotton swabs D. Blood bags E. Infected gowns, mask, shoe covers, cap 4.  Expired or Discarded  Medicines:   including antibiotics (except cytotoxic) 5. Chemical Waste: A. Discarded disinfectants, Cleaning agents B. X-ray film developing liquid, Infected secretions C. Aspirated body fluids, Liquid from laboratories 6. Microbiology, Biotechnology, and other clinical  lab waste 7. Chemical Liquid Waste Yellow bin/ bag with the cytotoxic label: 1. Used, discarded, and expired cytotoxic drugs whether in plastic vaccutainers, sy...
Read more

Design equations of Rectangular Microstrip Patch Antenna

-
Image
Following design equation can be used to calculate the width and length of rectangular microstrip patch antenna and simulation of 2.4 GHz inset-feed rectangular patch antenna can be found in follwing video.  Microstrip antenna with inset-feed line                           Part-1 Design step for the calculation of W and L Step-1 : To calcualte width 'W' use follwing formula Step-2:   Calculate the effective dielectric constant using formula below. Here    ' ε r '  is relative  dielectric constant of the material. 'h' is height of the substrate and W is the width of patch calculated in first step. Step-3:   Calculate ΔL using formula below. Step-4:   Calculate length of the patch using formula below. v 0    is speed of light in free space. Part-2 Feedline calculation Step-1:   Calculate the input impdedance of the pa...
Read more

Spotters in "Environment and Health: Mosquitoes- Anopheles" for CFM & MPH students

-
Image
Anopheles Mosquito: Also known as the sophisticated mosquito. The flight range is 3-5 km. Around 45 species of anopheles mosquitoes have been found in India but only a few of them have been incriminated as vectors or carriers of malaria. These are An. fluviatilis & An. minimum (foot-hill regions), An. sundaicus & An. stephensi (coastal regions) and An culicifacies & An. philippinensis (planes). 1. Eggs: Important points: Eggs laid on the surface of the clean water. 100-250 at a time. This stage lasts for 1-2 days. Laid singly, boat-shaped & possess lateral floats. 2. Larva: Important points: The larva is a free-swimming creature. Passes through 4 stages called ' instars ' with moulting between each stage. Floats horizontally in water/ rests parallel to the water surface. No siphon tube at the tip of its abdomen.  Palmate hairs present on abdominal segments. 3. Pupa: Important points: The pupa is comma-shaped in appearance, with a large rounded cephalothorax and...
Read more

ORS : A boon in dehydration

-
Image
What is ORS? Oral re-hydration salts: It is a glucose-electrolyte formula given by WHO/UNICEF, used for correction of acute diarrhea due to all causes and dehydration in all age groups with aim to reduce mortality. It is available in powder form in sachets/ ready-made solution or it can be easily made at home. How it works? The combination of electrolytes and sugar together stimulates water and electrolyte absorption from the gut and hence  capable of correcting water and electrolyte deficit in conditions such as diarrhea and vomiting. Reasons to celebrate ORS day? ORS Day is celebrated every year on 29th July:  To spread awareness about the importance of Oral Rehydration Salts (ORS) as a low cost method of health intervention.   Among infants and young children, acute diarrhoeal diseases are one of the leading causes of mortality in many developing countries.   Dehydration particularly affects infants, children and old people.  Diarrhea...
Read more

Diabetes : Lets learn how to inject insulin

-
Image
  What is the need? The proper injection of insulin is very important to allow the body to function normally hence we should be very strict about the way we manage the insulin injections.  Common mistakes done: Poor mixing technique when mixing insulin. Wrong doses (because of poor eyesight). Poor injection technique—into the skin or muscle rather than the soft, fatty layer.  Not taking insulin when you feel ill. When to inject insulin? Develop a set routine, including eating your meals on time and giving the injections about 30 minutes before your meal Where to inject insulin? The injection should go into the fatty (subcutaneous) tissue between the skin and muscle.  Abdomen below the navel is the best place.  Other suitable areas are the buttocks and thighs.  These areas having a good layer of fat under the skin and are free of large blood vessels and nerves.  It is advisable to stick to one area, and the abdomen is recommended.  Avoid ...
Read more

Spotters in "Environment and Health: Fly control measurers " for CFM & MPH students

-
Image
1. Environmental control: Important points: The best way to control houseflies is to eliminate their breeding places & environmental sanitation. A clean house with clean surroundings is the best answer to the fly problem. Storing garbage, kitchen wastes, and other refuse in bins with tight lids, pending disposal. Efficient collection, removal & disposal of refuse by incineration, composting & sanitary landfill. Provision of Sanitary latrines, e.g, pit privies, septic tanks, water-seal latrines & sanitary system. Stopping open-air defecation. Sanitary disposal of animal excreta. Stepping up general sanitation.  2. Insecticidal control: Important points: Insecticides are only a supplement, but not a substitute for sanitation. (i) Residual sprays: It showed resistance to DDT in 1948 & also developed resistance to other organochlorines, organophosphorus, and carbamate pesticides. Susceptible flies may be killed by DDT (5%), methoxychlor (5%), lindane (0.5%), or chlo...
Read more

National Nutrition Week: Healthy diet for Adolescents

-
Image
  Who are Adolescents? As per WHO Adolescents are persons in age group 10-19 years & constitute about 1/4th of India's population. What is the need? Adolescents undergo rapid changes in body size, physiology, psychology & social functioning as it is a transition from childhood to adulthood. It is a phase of rapid growth & development hence nutritional needs vary for them & needs to be taken care. When National Nutrition Week is celebrated? 1st to 7th September every year in India to focus on various aspect of Nutrition among all age groups. What should be included in diet? Grains: 4 - 8 bowls Vegetables: at least 3 servings Fruits: at least 2 servings Meat, fish, egg and alternatives: 200 - 300 gm Milk and alternatives: 2 servings Fat/oil, salt and sugar : eat the least Fluid: 6 - 8 glasses Healthy points for adolescent girls: The menstruation related needs of the girls make the nutrient requirement/ unit body weight more than boys for them Build strong bones: ...
Read more

Spotters in "Environment and Health: Insecticides" for CFM & MPH students

-
Image
Insecticides:   These are substances that are used to kill insects.  Pesticides:   It is a general term that includes  insecticides, fungicides rodenticides, herbicides,  disinfectants, repellents, and other chemicals used for the  control of pests. Insecticides are classified into 3 groups: Contact  poisons, Stomach poisons and Fumigants.  CONTACT  POISONS: These are those insecticides that kill insects primarily by contact  e.g., pyrethrum, DDT, HCH, dieldrin.  STOMACH POISONS: These  are those insecticides which when ingested cause the death of the  insects, e.g., Paris green, sodium fluoride.  FUMIGANTS: These are  those insecticides that give off vapours that have a lethal effect on  the insects, e.g., sulphur dioxide. 1. DDT  (Dichloro-diphenyl-trichloroethane) :  It was first  synthesized in 1874, by a German chemist, Ziedler . I ts insecticidal properties were discovered by the Swis...
Read more