A piece of wire of resistance 4 ohm is bent through 180' at its midpoint and the two halves are twisted together. Then the resistance is.
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A piece of wire with a resistance of 4 ohms is bent at its midpoint and the two halves are twisted together. What is the new resistance?
The total resistance of the full length of the wire= 4 ohms
Resistance of the two pieces of equal length bent at the midpoint and free ends brought together= 2 ohms.
When you twisted the wire the resistances of 2 ohms each are connected in parallel together, the effective resistance of the two wire connected in parallel:
1/R = 1/2 + 1/2 =2/2= 1 , therefore effective resistance= 1 ohm.
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