Physics-
General
Easy

Question

A potential divider is used to give outputs of 2V and 3V from a 5V source, as shown in figure. Which combination of resistances, R1 , R2 and R3 gives the correct voltages?

  1. 1 k capital omega 1 k capital omega 2 k capital omega    
  2. 2 k capital omega 1 k capital omega 2 k capital omega    
  3. 3 k capital omega 2 k capital omega 2 k capital omega    
  4. 3 k capital omega 2 k capital omega 3 k capital omega    

The correct answer is: 2 k capital omega 1 k capital omega 2 k capital omega


    For resistors in series connection, current (I) is the same through the resistors. In other words, ratio of the voltage drop across each resistor with its resistance is the same.
    That is I equals fraction numerator 5 minus 3 over denominator R subscript 1 end subscript end fraction equals fraction numerator 3 minus 2 over denominator R subscript 2 end subscript end fraction equals fraction numerator 2 over denominator R subscript 3 end subscript end fraction text  i.e.,  end text R subscript 1 end subscript colon R subscript 2 end subscript colon R subscript 3 end subscript equals 2 colon 1 colon 2

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