a piece of wire of resistance 4 ohm is bent through 180 degree at its midpoint and the two halves are twisted togther,then the resistance is
question no 9
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Given,
Total resistance of the full length of the wire= 4 ohms
Thus, resistance of the two pieces of equal length bent at the midpoint and free ends brought together= 2 ohms.
After twisting the wire, the resistances of 2 ohms each are connected in parallel together.
Therefore, the effective resistance of the two wire connected in parallel:
1/R = 1/2 + 1/2 =2/2= 1 , therefore effective resistance= 1 ohm.
Total resistance of the full length of the wire= 4 ohms
Thus, resistance of the two pieces of equal length bent at the midpoint and free ends brought together= 2 ohms.
After twisting the wire, the resistances of 2 ohms each are connected in parallel together.
Therefore, 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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Answer:
I ohm
Explanation:
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