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NEET Sample Paper NEET Sample Test Paper-10

  • question_answer
    If the flux of magnetic through a coil of resistance R and having n turns changes from \[{{\phi }_{1}}\] to \[{{\phi }_{2}},\] then the magnitude of the charge that possess through the coil is:

    A)  \[\frac{\left( {{\phi }_{2}}-{{\phi }_{1}} \right)}{R}\]                         

    B)  \[\frac{n\,\left( {{\phi }_{2}}-{{\phi }_{1}} \right)}{R}\]

    C)  \[\frac{\,\left( {{\phi }_{2}}-{{\phi }_{1}} \right)}{nR}\]                    

    D)  \[\frac{nR}{\,\left( {{\phi }_{2}}-{{\phi }_{1}} \right)}\]

    Correct Answer: B

    Solution :

    Induced emf is \[|e|=n\frac{\Delta \phi }{\Delta t}\] Now,     \[\Delta q=i\Delta t=\frac{e}{R}\Delta t=\frac{n\Delta \phi }{R\Delta t}\times \Delta t\]                 \[=\frac{n\Delta \phi }{R}=\frac{n({{\phi }_{2}}-{{\phi }_{1}})}{R}\]     


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