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Dinesh Gupta Grade: 12
        

a point charge q is located on axis of disc of radius r at distance b from the plane of disc.if one-fourth of electric flux from charge passes through disc then.......
(a)r = b    (b)r = 2b

7 years ago

Answers : (2)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear Dinesh


Draw a sphere whose center is at a distance b from the disk and which cover the disk


 


7477-278_7662_untitled.JPG


we know that flux throug a segment which makes an angel  θ at the center is


Φ=Q/2ε (1-cosθ)


 


where cosθ = b/(b2+r2)1/2


given flux passes in 1/4 th


so Q/2ε (1-cosθ)  =Q/4ε


    1-cosθ = 1/2


     cosθ =1/2


  b/(b2+r2)1/2 =1/2


  r =√3 b


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7 years ago
Nitish Sainani
24 Points
										
(it is disk not the spherical cap how can you take a sphere)


 
one year ago
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