A) \[\frac{{{l}_{1}}}{{{l}_{1}}-{{l}_{2}}}\]
B) \[\frac{{{l}_{2}}}{{{l}_{2}}-{{l}_{1}}}\]
C) \[\frac{{{l}_{1}}}{{{l}_{1}}+{{l}_{2}}}\]
D) \[\frac{{{l}_{1}}}{{{l}_{2}}-{{l}_{1}}}\]
Correct Answer: A
Solution :
When key is at point \[{{V}_{1}}=i{{R}_{1}}=x{{l}_{1}}\] when key is at (3) \[{{V}_{2}}=i({{R}_{1}}+{{R}_{2}})=x{{l}_{2}}\] \[\frac{{{R}_{1}}}{{{R}_{1}}+{{R}_{2}}}=\frac{{{l}_{1}}}{{{l}_{2}}}\] \[\frac{{{R}_{1}}}{{{R}_{2}}}=\frac{{{l}_{1}}}{{{l}_{2}}-{{l}_{1}}}\]You need to login to perform this action.
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