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Question

The solid angle subtended at any point inside the surface due to small area ds is given by 


A
r2dscosθ
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B
dscosθr2
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C
dscosθr
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D
r2dscosθ
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Solution

The correct option is B $$\dfrac{ds \cos \theta }{r^2}$$
The solid angle $$\Omega=\dfrac{A}{r^2}$$
where, $$A=$$ area
When solid angle subtended at any point inside the surface due to small area $$ds$$
$$A=ds$$ $$cos\theta$$
Solid angle $$\Omega=\dfrac{dscos\theta}{r^2}$$
The correct option is B.

Physics

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