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NEET Sample Paper NEET Sample Test Paper-56

  • question_answer
    The primary and secondary coils of a transformer have 50 and 1500 turns, respectively. If the magnetic flux \[\phi \] linked \[\phi ={{\phi }_{\circ }}+4t,\]with the primary coil is given by  where is in Wb, t is time in second and \[{{\phi }_{\circ }}\]is a constant, then the output voltage across the secondary coil is:

    A) 90V                 

    B) 120V   

    C) 220V                

    D) 30V

    Correct Answer: B

    Solution :

    [b] Magnetic flux linked with primary coil \[\phi ={{\phi }_{0}}+4t\] \[{{e}_{p}}=\frac{d\phi }{dt}=4V\] Transformer ratio \[\frac{{{N}_{p}}}{{{N}_{p}}}=\frac{{{V}_{p}}}{{{V}_{s}}}\] \[\frac{50}{1500}=\frac{4}{{{V}_{s}}}\] \[{{V}_{s}}=120V\]


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