anonymous
  • anonymous
A wire is doubled over i tsel f . What wi l l be the new resistance i f the Original resistance is 4 ohms?
Physics
jamiebookeater
  • jamiebookeater
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Owlfred
  • Owlfred
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anonymous
  • anonymous
wire is doubled so area is increased by 4 times. now resistance varies inversely with area so now resistance is 4/4=1
anonymous
  • anonymous
resistance proportional to (length/area). in this case length halves and area cross section doubles. so new resistance is 1/4 times original resistance..therefore ans is 1 ohm..

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