Question

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

A
r2dscosθ
B
dscosθr2
C
dscosθr
D
r2dscosθ

Solution

## The correct option is B $$\dfrac{ds \cos \theta }{r^2}$$The solid angle $$\Omega=\dfrac{A}{r^2}$$where, $$A=$$ areaWhen 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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