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प्रश्न
How does an increase in the temperature affect the specific resistance of a :
(i) Metal and
(ii) Semiconductor ?
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उत्तर
(i) Metal : Specific resistance increases
(ii) Semiconductor : Specific resistance decreases
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संबंधित प्रश्न
Write the SI unit of resistivity
In an experiment of verification of Ohm’s law following observations are obtained.
|
Potential difference V (in volt) |
0.5 | 1.0 | 1.5 | 2.0 | 2.5 |
| current I (in ampere) | 0.2 | 0.4 | 0.6 | 0.8 | 1.0 |
Draw a V-I graph and use this graph to find:
- the potential difference V when the current I is 0.5 A,
- the current I when the potential difference V is 0.75 V,
- the resistance in a circuit.
Rewrite the following statement by selecting the correct option.
The S.I. unit of resistance is __________.
State and define Ohm’s law.
Draw a neat diagram for the verification of Ohm’s law by voltmeter-ammeter method. By another diagram show the relation between p.d. and current.
SI unit of resistance is:
Obtain the macroscopic form of Ohm’s law from its microscopic form and discuss its limitation.
The temperature of a conductor is increased. The graph best showing the variation of its resistance is:
The resistance of a resistor is reduced to half of its initial value. If other parameters of the electrical circuit remain unaltered, the amount of heat produced in the resistor will become ______.
A current of 0.8 A flows in a conductor of 40 Ω for 1 minute. The heat produced in the conductor will be ______.
