A) 3V
B) 2.25V
C) 4V
D) 4.5V
Correct Answer: C
Solution :
\[\operatorname{emf} \propto balanced length\] \[{{\operatorname{E}}_{1}}-k{{\ell }_{1}}\] ...(1) \[{{\operatorname{E}}_{2}}-k{{\ell }_{2}}\] ...(2) \[{{\operatorname{E}}_{1}}=E,~{{E}_{2}}=3V\] \[{{\ell }_{1}}=60,~{{\ell }_{2}}=45\] \[\frac{E}{3}=\frac{k\times 60}{k\times 45}\] \[\operatorname{E} = 4V\]You need to login to perform this action.
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