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Easy

Question

An aluminum open parentheses alpha subscript A l end subscript equals 4 cross times 10 to the power of negative 3 end exponent divided by blank to the power of 0 end exponent C close parentheses wire resistance ' R subscript 1 end subscript ' and carbon wire open parentheses alpha subscript c end subscript equals 0.5 cross times 10 to the power of negative 3 end exponent divided by blank to the power of 0 end exponent C close parentheses resistance ' R subscript 2 end subscript ' are connected in series to have a resultant resistance of 18 ohm at all temperatures. The values of R subscript 1 end subscript and R subscript 2 end subscript in ohms

  1. 2,16    
  2. 12,6    
  3. 13,5    
  4. 14,4    

The correct answer is: 2,16

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