Physics-
General
Easy

Question

Bars of two different metals are bolted together, as shown in figure. The distance x does not change with temperature if:–

  1. fraction numerator l subscript A end subscript over denominator l subscript B end subscript end fraction equals fraction numerator alpha subscript A end subscript over denominator alpha subscript B end subscript end fraction    
  2. fraction numerator l subscript A end subscript over denominator l subscript B end subscript end fraction equals fraction numerator alpha subscript B end subscript over denominator alpha subscript A end subscript end fraction    
  3. fraction numerator l subscript A end subscript superscript 2 end superscript over denominator l subscript B end subscript superscript 2 end superscript end fraction equals fraction numerator alpha subscript A end subscript over denominator alpha subscript B end subscript end fraction    
  4. fraction numerator l subscript A end subscript superscript 2 end superscript over denominator l subscript B end subscript superscript 2 end superscript end fraction equals fraction numerator alpha subscript B end subscript over denominator alpha subscript A end subscript end fraction    

The correct answer is: fraction numerator l subscript A end subscript over denominator l subscript B end subscript end fraction equals fraction numerator alpha subscript B end subscript over denominator alpha subscript A end subscript end fraction

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