​NE​WS & EVENTS​
Working Principle of Galvanometer
The moving coil galvanometer working principle is based upon the fact that when electric current flows in a coil placed in a magnetic field, a deflecting torque acts upon the coil whose magnitude depends upon the strength of the current.
From the measurement of the deflection of the coil, the strength of the current can be computed.
Moving-coil galvanometers are of two types:
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Suspended coil galvanometer and,
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Pivoted-coil or Weston galvanometer.
Force and Torque on Current Carrying Rectangular Coin in Magnetic Field
Motors are the most common application of magnetic force on current-carrying wires. Motors contain loops of wire in a magnetic field. When current is passed through the loops, the magnetic field exerts torque on the loops, which rotates a shaft. Electrical energy is converted into mechanical work in the process.
Tribes of World and Zones of Earth
The tribe is a social division in a traditional society consisting of families or communities linked by social, economic, religious, or blood ties, with a common culture and dialect, typically having a recognized leader whereas race of humans is a grouping based on shared physical traits, ancestry, or genetics. About 90% of the world's population lives in the northern hemisphere of which about 60% lives in Asia alone; and 30% lives in the temperate latitudes (mainly Europe) and barely 1 % lives beyond 600 north.
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The world is sometimes divided into five zones according to latitude. The tropical, or Torrid Zone, lies near the Equator and extends to the Tropic of Cancer in the north and the Tropic of Capricorn in the south. The north and south frigid zones (also known as the Arctic and the Antarctic) lie near the poles. In between them lie the north and south temperate zones.
