Physics, asked by tamoghnadbpc, 1 year ago

A wire having resistance of 4ohm is stretched to triple its length. With proper working show what the new resistance becomes

1231221: Answer and solution of Mahakalsar8 is wrong then why you had choosen his answer as brainliest????

tamoghnadbpc: his answer is right

Answers

Answered by mahakalsarkar8

As we know that ;

Resistance = Resistivity*length/area

Here we note that the resistance is directly proportional to length and inversely proportional to area of cross section ....

Now a/c to question,;

Length of wire is double then area is reduced to half...

Now

New resistance = resistivity*2length/area/2

New resistance =(resistivity*length/area)*4

New resistance = 4resistance

1231221: But answer is wrong.

tamoghnadbpc: NO it is right

1231221: It's wrong because in question the length is stretched triple to the original length but you have taken as double.

Answered by 1231221

Hi,

Dear student,

You can find solution for your question in attachment.

Hope it helps you...

Attachments:

1231221: Please mark my answer as brainliest.... please....

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