2. Sample Papers
  3. NEET

NEET Sample Paper NEET Sample Test Paper-20

  • question_answer
    In an ac generator, the number of turns in the coil is 2000 and the area of the coil is \[0.1\text{ }{{m}^{2}}.\] The coil is rotated at an angular frequency of \[200\,\text{rad}\,{{\text{s}}^{-1}}\] in a magnetic field of 0.2 T. What is the peak value of the induced emf?                

    A)  1000 V                       

    B)  2000V

    C)       4000V            

    D)       8000V            

    Correct Answer: D

    Solution :

    Instantaneous induced emf is \[e=nAB\omega \sin \omega t\] Peak value \[{{e}_{0}}\]of e is obtained when cot is an integral multiple of \[\pi /2.\]Thus\[{{e}_{0}}=nAB\omega \] or \[{{e}_{0}}=2000\times 0.1\times 0.2\times 200=8000\,V.\] Hence, the correction option is (d).


You need to login to perform this action.
You will be redirected in 3 sec spinner