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Q.

The solid angle subtended by the periphery of an area 1 cm2 at a point situated symmetrically at a distance of 5 cm from the area is

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a

2×10-2 steradian

b

4×10-2 steradian

c

6×10-2 steradian

d

8×10-2 steradian

answer is B.

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Detailed Solution

Solid angle, dΩ=dAr2=1 cm25 cm2=4×10-2 steradian

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