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How Does the Resistance of a Conductor Depend On: Length of the Conductor? - Science

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प्रश्न

How does the resistance of a conductor depend on: 

length of the conductor?

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उत्तर

The resistance of a conductor depends on its length. It is directly proportional to the length, R α l.

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अध्याय 1: Electricity - Exercise 4

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लखमीर सिंग Physics (Science) [English] Class 10
अध्याय 1 Electricity
Exercise 4 | Q 18.1

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संबंधित प्रश्न

On what factors does the resistance of a conductor depend?


What is (a) the highest, (b) the lowest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?


 What happens to the resistance as the conductor is made thinner?


Name the electrical property of a material whose symbol is "omega".


Which among iron and mercury is a better conductor of electricity?


What do you understand by the "resistivity" of a substance?


What would be the effect on the resistance of a metal wire of:

increasing its length?


What would be the effect on the resistance of a metal wire of:  

increasing its temperature?

 


Write the relation between resistance and electrical resistivity of the material of a conductor in the shape of a cylinder of length `'l'`  and area of cross-section `'A'` . Hence derive the S.I. unit of electrical resistivity.


Resistance of a metal wire of length 5 m is 100 Ω . If the area of cross - section of the wire is `3 × 10^-7  "m"^2` , Calculate the resistivity of the metal . 


How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistors R1, R2 and R3 in series connected to a battery of V volts?


Materials which allow larger currents to flow through them are called:


The element used almost exclusively for filaments of incandescent lamps:


The effective resistance between A and B is:


A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has an area of cross-section:


Assertion: Conductors allow the current to flow through themselves.

Reason: They have free charge carriers.


The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10-8 Ω, find the length of this wire.


How will the resistance of a wire be affected if its

  1. length is doubled, and
  2. radius is also doubled ?

Give justification for your answer.


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