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`        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 ans:(a)`
7 years ago

147 Points
```										Dear shefali

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

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

This question is also in Resnick Halliday problem number 64 chapter 24 .and the answer given is r=√3 b

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7 years ago
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