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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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अध्याय 4: Electricity - Exercise 4 [पृष्ठ २१४]

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लखमीर सिंग Physics Part 1 [English] Class 10
अध्याय 4 Electricity
Exercise 4 | Q 12. (a) | पृष्ठ २१४

संबंधित प्रश्न

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


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 ______.


Write any two characteristics of a series combination of resistors.


Find the equivalent resistance between points A and B.


When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:

(a) 0.3
(b) 3
(c) 4
(d) 12


How does the resistance of a wire change when:

 its diameter is tripled? 

 


A p.d. of 4 V is applied to two resistors of 6 Ω and 2 Ω connected in series. Calculate:

(a) the combined resistance
(b) the current flowing
(c) the p.d. across the 6 Ω resistor


What is the resistance between A and B in the figure given below?

 


Draw a V-I graph for a conductor at two different temperatures. What conclusion do you draw from your graph for the variation of resistance of conductor with temperature?


A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).


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

Three resistors of 6.0 Ω, 2.0 Ω and 4.0 Ω are joined to an ammeter A and a cell of emf 6.0 V as shown in the following figure. Calculate :

  1. the effective resistance of the circuit.
  2. the reading of ammeter.


Choose the correct alternative and rewrite the following:

You are given three equal resistances. In how many combinations can they are arranged?


Bends in a rubber pipe reduce the flow of water through it. How would the bands in a wire affect its electric resistance?


Why are thick copper wires used as connecting wires?


How does the resistivity of an alloy such as constantace depends on temperature.


Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell. Calculate the current in each resistor.


The resistance of two resistors joined in series is 8Ω and in parallel is 1.5Ω. Find the value of the two resistances.


In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be ______.


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