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In the arrangement shown in figure when the switch S2is open, the galvanometer shows no deflection for l=L/2. When the switch S2 is closed, the galvanometer shows no deflection for l=5L/12 . The internal resistance (r) of 6V cell, and the emf E of the other battery are respectively:
41523.jpg
  1. 3Ω,8V
  2. 2Ω,12V
  3. 2Ω,24V
  4. 3Ω,12V

A
3Ω,8V
B
2Ω,12V
C
2Ω,24V
D
3Ω,12V
Solution
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41523.jpg
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