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A metal disc of radius a  rotates with an angular velocity ω about an axis perpendicular to its plane passing through its centre in a magnetic field of induction B  acting perpendicular to the plane of the disc. The induced emf between the rim and axis of the disc.
  • a)
    -2Bπ2a2
  • b)
  • c)
    -Bπa2ω
  • d)
    -Bπa2
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A metal disc of radiusa rotates with an angular velocity ωabout ...
In the presence of uniform magnetic field B perpendicular to the disc in outward direction (say) Force on a unit positive charge

  will lie in radially outward direction)
Work done in moving a unit positive charge from centre to the rim is equal to potential difference ε

The correct answer is:  
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Most Upvoted Answer
A metal disc of radiusa rotates with an angular velocity ωabout ...
In the presence of uniform magnetic field B perpendicular to the disc in outward direction (say) Force on a unit positive charge

  will lie in radially outward direction)
Work done in moving a unit positive charge from centre to the rim is equal to potential difference ε

The correct answer is:  
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