Question

What should be the length of nichrome wire of resistance 5 ohm if the length of similar wire is 80cm and resistance 2.5 ohm?​

Answer 1

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⏭️ As R = p L/A

So, According to question;

2.5 ohm = p (80 cm) / A

or, 2.5 / 80 ohm cm = p / A ..................(1)

Let L be the length of 5 ohm resistance wire

So, 5 ohm = p L/A

or, 5 ohm = L × p / A

or, 5 ohm = L × 2.5/80 ohm cm ...from (1)

or, L = 5×80/2.5 cm

or,L=400/2.5 cm

or, L = 160cm.

So, required length will be 160cm.

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Answer 2

Answer:

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