Science, asked by kanishk0123, 1 year ago

a 4ohm resistance wire is doubled on it. calculate the new resistance of the wire?

Answers

Answered by Anonymous
60
We consider wire is doubled on it means to fold the length of wire. It means its length will get half and area of cross section will get doubled.

∴ Let the resistance of the wire originally 'R' of length 'L' and area of cross-section 'A' with resistivity of material is 'p',

Then

R = p l/A = 4Ω

Now, for new arrangement,

p' = p

l' = l / 2

A' = 2A

Thus,

R' = p' l'/A' = p (l /2) ÷ 2A = !/4 (p l / A) = 1/4R = 1/4 × 4 = 1Ω.


Answered by atinshayawasthi2004
48

Answer:

Explanation:mark as brainless...

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