Jean-Baptiste Biot and Felix Savart jointly gave the Biot-Savart’s law in the year 1820. This is a rule or law which helps to calculate the magnitude of the magnetic field due to a current carrying conductor. Let ‘dl’ be a…
Theories Related To Acid and Base
There are different theories which help to determine whether a substance is an acid or base. The major and generally accepted theories are given below: 1. Arrhenius Theory According to Arrhenius theory, acid is a chemical substance which gives hydrogen…
Yahoo! Stops Its Email Service in China
Yahoo! is one of the famous companies which have been providing various vital services to the internet users all over the world. Being launched in March 1994, it is very popular due to the wide variety of services it provides.…
HSEB Model Question Set 1 (Chemistry) – Grade 11
Time: 3 hours Full Marks: 75 Pass Marks: 27 Group ‘A’ Attempt any fifteen questions. (2 × 15 = 30) 1. Calculate the percentage of sulphur in Na2S2O3 (Na = 23, S = 32 and O = 16). [Ans: 40.5%]…
Different Grades of Purity of Alcohol
Alcohols are one of the widely used organic compounds. They are the organic compounds which contain hydroxyl (-OH) group as their functional groups. In other words, alcohols can be defined as the hydroxyl derivative of aliphatic hydrocarbons. Alcohols are represented…
HSEB Model Question Set 1 (Biology) – Grade 12
Time: 3 hours Full Marks: 75 Pass Marks: 27 Section A (Botany) 1. Answer any seven questions in very short. (1 × 7 = 7) a. Write the function of xylem. b. Name the components of a nucleotide. c. Give…
Motion of An Electron in Electric Field
Let us consider that, an electron of mass ‘m’ moves with initial horizontal velocity ‘vx‘. While the electron enters the electric field between the parallel plates, it is attracted towards the upper positive plate. The electrostatic force with which electron…
Indicators and Titration Curves
Indicators are the chemical substances which are used to determine the end points of titrations. Methyl orange, phenolphthalein, starch solution, erichrome black-T are some examples of indicators. Indicators are used in acid-base titration and have different colours in acidic and…
Hall Effect
When magnetic field is applied perpendicular to a current carrying conductor, then voltage is developed across the conductor in the direction perpendicular to both current and magnetic field. This effect is called Hall effect. Let us consider a rectangular cross…
Moving Coil Galvanometer
Moving coil galvanometer is a device which is used to detect and measure small electric currents present in an electric circuit. Principle It is based on the principle that, “When a current carrying coil is placed in magnetic field, it…