Question

a wire of resistance 4 ohm is bent to form a circle what is the resistance between two diametrically opposite ends​

Answer 1

Answer:

2 ohm

Explanation:

Here we will find the resistance in parallel

So,

1/R = 1/R1+1/R2

1/R = 1/4 +1/4

1/R = 2/4

1/R = 1/2

R= 2 ohm

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Answer 2

Answer:

Two semi circles form a parallel connection. Each semi circle has a resitsnce = 2 ohm

Two resistances in parallel results in an effective resistance of (1/R + 1/R)^-1 -= 1 ohm.

Resistnce = 1 ohm.