Question

how to find the resis tance across the ends of the diametre​

Answer 1

Explanation:

The resistance across the ends of the diameter is 4.5 ohm. We know that, The resistance is the product of the resistivity of the wire and length of the wire divided by the area of the wire. Hence, The resistance across the ends of the diameter is 4.5 ohm.

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Answer 2

AnswersWhen the wires are connected across the diameter, the circle can be imagined as resistors of two equal semicircles, connected in parallel.

When the wires are connected across the diameter, the circle can be imagined as resistors of two equal semicircles, connected in parallel.Now, a circle has resistance of 10 ohm. The semicircles will have resistance of 5 ohm each. As they are connected in parallel, net resistance is 5/2 or 2.5 ohm.