Question

A wire of 9ohm and 30cm is tripled on itself. Find its new resistance.

Answer 1

hi friends......

When a wire tripled itself its length is 1/3 rd and area becomes tripled and area is inversely proportional to resistance.

case 1 :

R = p l/a                                                                    Here p = constant

9 ohm = p 30/a

a = 30/9 m² 

now length becomes 1/3 rd and area tripled

Therefore a = 30/9 * 3 = 10 m² and l = 1/3 * 30 = 10 m

Now R = p l/a

R = 10/10 = 1 ohm.

hope it helps !!!!

Answer 2

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HERE IS UR ANSWER

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R=pL/A

New resistance (R') is 1 ohm.