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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    In a potential meter, a voltage source and battery of 3 V are balance at length 60cm length 45 cm respectively. The emf unknown voltage will be

    A)  3 V              

    B)  4 V

    C)  4.5 V            

    D)  6 V

    Correct Answer: B

    Solution :

     \[{{E}_{1}}=k{{L}_{1}},{{E}_{2}}=k{{L}_{2}}\] \[\therefore \] \[{{E}_{1}}={{E}_{2}}\times \frac{{{L}_{1}}}{{{L}_{2}}}\] \[=3\times \frac{60}{45}\] \[=4\,V\]


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