Physics, asked by jenn2003, 1 year ago

A wire of length 10cm and diameter 1mm has resistivity 5ohm meter. find resistance.

Answers

Answered by govindsharmazerofour

it should be the answer

Attachments:

jenn2003: sorry.,can you please explain?

govindsharmazerofour: yes I can , first Rho is the resistivity l is the length of the given wire and A is the area of cross section of the wire , then i just put all the things in the given formula in MKS (metre kg second) unit system

govindsharmazerofour: thanks for asking your doubt

jenn2003: i know all these, but

jenn2003: ok send me step by step.. i have doubt in cross section area

govindsharmazerofour: consider wire as a long cylinder , now at the end of the wire there are two circular sections , now the area of these circular section is known as area of cross section

jenn2003: i know wht is cross section area

jenn2003: sorry.. n thnkyou

jenn2003: you tried well

Answered by muscardinus

Given that,

Length of wire, l = 10 cm = 0.1 kg

Diameter of the wire, d = 1 mm = 0.001 m

Radius of wire, r = 0.0005 m

Resistivity, $\rho=5\ \Omega-m$

To find,

Resistance of the wire.

Solution,

Resistance of wire in terms of resistivity, length and area is given by :

$R=\rho \dfrac{l}{A}$

A is area of wire

$R=5\times \dfrac{0.1}{\pi (0.0005)^2}\\\\R=6.36\times 10^6\ \Omega$

So, the resistance of the wire is $6.36\times 10^6\ \Omega$ .

Learn more,

Resistance

https://brainly.in/question/12473838

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