Question

answer this question.
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Answer 1

Answer:

5

Explanation:

Resistance can be measure using the following formula…

R=pL/A where

p = resistivity

L = length

A= Cross sectional area.

When we bend the 20 ohm resistance wire into a circle, the length of each of the points in parallel is half of that of the original wire. So, using the above formula, we get resistance of each branch to be 10 ohms.

Now since the 2 points are in parallel, the effective resistance across diametrically opposite ends AB can be calculated using the following formula…

= 1/R(total) = 1/10+1/10

= 1/R(total) = 2/10

= R(total) = 10/2

R = 5 ohms

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