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Constantan: Constantan is a copper-nickel alloy. The amount of nickel in constantan is 40%.
Properties:
1. It is silver like appearance.
2. Its electrical resistivity is 5.2*10-8 ohm-m.
3. Its SPECIFIC gravity is 8.9.
4. Its melts at 1300 degree c.
5. The maximum permissible working temperature is about 500 degree c.
6. It can be drawn into thin wires.
7. It is highly corrosion resistant.
USES: It is used for making resistance elements for items like loading rheostats and starters for electric motors. It is also used in thermocouples.
Electromagnetism: A temporary magnet formed by winding a coil of insulated copper wire around a piece of shift iron is known as electromagnet. When current is passed it behaves
Eddy current loss is proportional to the (A) Frequency. (B) Square of the frequency. (C) Cube of the frequency. (D) Square-root of the frequency.
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find the value of 10J when 1 kg,10cm,and 5 min is given
é How many types of breakdown ?
For germanium the forbidden gap is (A) 0.15ev. (B) 0.25ev. (C) 0.5ev. (D) 0.7ev. Ans: For germanium the forbidden gap is 0.7ev.
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