NEET Sample Paper NEET Sample Test Paper-16

  • question_answer 25) A wheel having metal spokes 1 m long between its axle and rim is rotating in a magnetic field of flux density \[5\times {{1}^{-5}}T\]normal to the plane of the wheel. An emf of 22/7 mV is produced between the rim and the axle of the wheel. The rate of rotation of the wheel in radians per second is:

    A) 10                   

    B) 20                   

    C)      30                 

    D)      40

    Correct Answer: B

    Solution :

    Induced \[em\,V=Blv\]or \[v=\frac{V}{Bl}=\frac{\frac{22}{7}\times {{10}^{-3}}}{5\times {{10}^{-5}}\times 1}=20\,T\] or \[v=w=20\,rad/\sec .\] Hence, the correction option is (b).

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