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Two rods, one of aluminum and the other made of steel having initial length l subscript 1 end subscriptand l subscript 2 end subscriptare connected to get her to expansion for aluminum and steel are l subscript 1 end subscript plus l subscript 2 end subscript and a s and respectively. If the length of each rod increases by the same amount when their temperature are raised by tdegreeC, then find the ratio l subscript 1 end subscript divided by open parentheses l subscript 1 end subscript plus l subscript 2 end subscript close parentheses

  1. alpha subscript s end subscript divided by alpha subscript a end subscript    
  2. alpha subscript a end subscript divided by alpha subscript s end subscript    
  3. alpha subscript s end subscript divided by open parentheses alpha subscript a end subscript plus alpha subscript s end subscript close parentheses    
  4. alpha subscript a end subscript divided by open parentheses alpha subscript a end subscript plus alpha subscript s end subscript close parentheses    

The correct answer is: alpha subscript s end subscript divided by open parentheses alpha subscript a end subscript plus alpha subscript s end subscript close parentheses


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