JEE Main & Advanced Sample Paper JEE Main Sample Paper-19

  • question_answer The following observations were taken while comparing the e.m.f s of two primary cells using a potentiometer. Balance point when \[{{E}_{1}}\] (Leclanche cell) in the circuit (\[{{\ell }_{1}}\]in cm) \[=350\] Balance point when \[{{E}_{2}}\] (Daniel cell) is the circuit (\[{{\ell }_{2}}\] in cm) \[=275\] The ratio \[({{E}_{1}}/{{E}_{2}})\] of emfs is approximately

    A)  \[1.30\]                        

    B)  \[1.17\]

    C)  \[1.27\]                        

    D)  \[1.5\]

    Correct Answer: D

    Solution :

     \[{{f}_{c}}=9\sqrt{{{N}_{m}}}=9\times \sqrt{9\times {{10}^{10}}}\] \[=2.7\times {{10}^{6}}Hz=2.7\,MHz\]


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