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Question

In the following circuit the potential difference between the points B and C is balanced against 40 cm length of potentiometer wire. In order to balance the potential difference between the points C and D, where should jockey be pressed

  1. 32 cm
  2. 16 cm
  3. 8 cm
  4. 4 cm


Solution

The correct option is A 32 cm
1R=110+110=210=15 or R1=5Ω
R2=4Ω,I1=40 cm,I2=?
l2=l1R2R1 or l2=40×45=32 cm
 

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