Physics-
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Question

In the figure, a ladder of mass m is shown leaning against a wall. It is in static equilibrium making an angle null and that between the floor and the ladder is mu subscript 2 end subscript . The normal reaction of the wall on the ladder is N subscript 1 end subscript and that of the floor is N subscript 2 end subscript . If the ladder is about to slip, then

  1. mu subscript 1 end subscript equals 0 mu subscript 2 end subscript not equal to 0 text  and  end text N subscript 2 end subscript t a n invisible function application theta equals fraction numerator m g over denominator 2 end fraction    
  2. mu subscript 1 end subscript not equal to 0 mu subscript 2 end subscript equals 0 text  and  end text N subscript 1 end subscript t a n invisible function application theta equals fraction numerator m g over denominator 2 end fraction    
  3. mu subscript 1 end subscript not equal to 0 mu subscript 2 end subscript not equal to 0 text  and  end text N subscript 2 end subscript equals fraction numerator m g over denominator 1 plus mu subscript 1 end subscript mu subscript 2 end subscript end fraction    
  4. mu subscript 1 end subscript equals 0 mu subscript 2 end subscript not equal to 0 text  and  end text N subscript 1 end subscript t a n invisible function application theta equals fraction numerator m g over denominator 2 end fraction    

The correct answer is: mu subscript 1 end subscript not equal to 0 mu subscript 2 end subscript not equal to 0 text  and  end text N subscript 2 end subscript equals fraction numerator m g over denominator 1 plus mu subscript 1 end subscript mu subscript 2 end subscript end fraction

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