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. The magnetic field is directly proportional to: the amount of current passing through the solenoid the number of turns of the solenoid. It also depends on the core material. Since the magnetic field formed by the solenoid is temporary it is used to make ele..

A bar magnet of magnetic moment 1.5 lies aligned with the direction of a uniform magnetic field of 0.22 tesla. (a) What is the amount of work required to turn the magnet so as to align its magnetic moment. (i) Normal to the field direction. (ii) Opposite to..

Summary - Electromagnetic induction (E.M.I) is the phenomenon of generating EMF by changing the number of magnetic lines of force associated with a circuit. The EMF so generated is called induced EMF and the corresponding current is called induced current. The number of magnetic..

In this method, different types of crops having different requirements are grown alternatively in the same soil so that the soil is not deprived of any particular nutrient. In the rotation of crops, the leguminous crops such as pulses, peas, beans, grams, groundnuts etc are sown inbetwee..

Water bodies are being constantly polluted by dumping of sewage which includes organic matter and by the runoff from the agricultural fields that contains fertilisers. Pollutants like sewage, organic wastes and fertilisers contain good amount of inorganic nutrients like nitrate..

Mass Energy Relation - Einstein derived a formula given the relation between mass and energy as E = mc 2 . Here 'm' is the mass, 'c' is the velocity of light and 'E' is the energy. This equation has given equal states to mass and energy. It states that a mass m has energy E given by the above formu..

Nuclear changes can be brought about by bombardment of nuclei with accelerated particles like neutrons, deuterons and protons. A particularly important process for the production of artificial radioactive isotope is the (n, g ) reaction, which is applied to synthesize new elements. Units o..

When lighter nuclides fuse together to form a heavy nucleus in a process called nuclear fusion, energy is produced and mass is lost. For example, two atoms of heavy hydrogen may fuse together to form helium and a neutron: The sum of the exact masses of the helium atom and the neutron is less tha..

>Science is not just a subject of study confined to laboratories or classrooms, but it forms a part of our daily life. It helps us to develop a scientific temperament. A large number of tools and techniques have been developed in the field of biology enabling us to study all the..

DNA Finger Prints - The technique of finger printing was perfected by British genetist Dr. Alec Jeffreys in 1984. fig. 25.9 Identical Twins No two people (other than identical twins) have exactly the same sequence of bases in their DNA. By detecting these, the differences in DNA sequences, it is po..