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Meghna Thapar 5 years, 10 months ago
The resistance of a conductor is directly proportional to its length (l) and inversely proportional to its area of cross section (A).
R µ/l A
R = ρ I/A
where ρ is a constant of proportionality called specific resistance or resistivity of the material of the conductor.
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Gaurav Seth 6 years ago
An electric bell consists of an iron core, on which is wound a wire as a coil. One end of the coil is connected to one terminal of a battery, and the other end to a steel rod that acts like a spring for the hammer touching the screw contact. The other terminal of the battery is connected to the screw contact with a switch in the middle.
Working of an electric bell
Electric current flows through the coil when the switch is ON, and the iron core acts as an electromagnet. The iron core attracts the hammer towards it. The hammer hits the bell and produces a sound. The circuit breaks at the screw contact when the hammer moves towards the iron core. At this point, the iron core ceases to be an electromagnet. The hammer is pulled back to its original position due to the spring action of the steel rod, and then touches the contact again to complete the circuit. The circuit is completed and current flows through the coil again, and the hammer strikes the bell again. The process repeats itself and you hear a ringing sound since the hammer keeps hitting the bell, until the switch is released.
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Yogita Ingle 6 years ago
A clan is a group of families or households claiming descent from a common ancestor. Tribal organisation is often based on kinship or clan loyalties.
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Yogita Ingle 6 years ago
The Ahoms were important tribe, predominant in Vedic India. They lived in Myanmar and migrated to the Brahmaputra valley in the early 13th century. The Ahoms did not possess their own kingdoms, but created their state by suppressing the older political system of the landlords, known as Bhuiyans.
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Any Khan 6 years ago
Yogita Ingle 6 years ago
Holozoic nutrition: It is a process by which animals take in their food. It involves different steps namely, ingestion, digestion, absorption, assimilation and egestion. Human beings exhibit holozoic mode of nutrition involving five basic steps.
- Ingestion: The process of taking food into the body is called ingestion.
- Digestion: the process in which the food containing large, insoluble molecules is broken down into small, water soluble molecules is called digestion.
- Absorption: The process in which the digested food passes through the intestinal wall into blood stream is called absorption.
- Assimilation: The process in which the absorbed food is taken in by the body cells and used for energy, growth and repair is called assimilation.
- Egestion: The process in which the undigested food is removed from the body is called egestion.
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Shalu Jain 6 years ago
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