मराठी

How Does the Resistance of a Pure Metal Change If Its Temperature Decreases?

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प्रश्न

How does the resistance of a pure metal change if its temperature decreases?

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उत्तर

The resistance of all pure metals increases on raising the temperature and decreases on lowering the temperature. Therefore, the resistance of a pure metal will decrease on decreasing the temperature.

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पाठ 4: Electricity - Exercise 4

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लखमीर सिंह Physics [English] Class 10
पाठ 4 Electricity
Exercise 4 | Q 12.1

संबंधित प्रश्‍न

In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables


Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 106Ω, (b) 1 Ω and 103Ω and 106Ω.


A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.


The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.


Write down an expression for the resistance of a metallic wire in terms of the resistivity.


 Give one example to show how the resistance depends on the nature of material of the conductor.


Give the law of combination of resistances in series.


What is (a) highest, and (b)Ω lowest, resistance which can be obtained by combining four resistors having the following resistances?

4 Ω, 8 Ω, 12 Ω, 24 Ω 

 


Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.


What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?


What is the value of a resistance if 20 V drives 2 A through it?

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Name the material of wire used for making standard resistances. Give a reason.


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Two wires of the same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is:


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