A)
B)
C)
D)
Correct Answer: B
Solution :
\[F=0\] when \[0\le r\le {{R}_{1}}\] because intensity is zero inside the cavity. F increase when \[{{R}_{1}}\le r\le {{R}_{2}}\] \[F\propto \frac{1}{{{r}^{2}}}\] when \[r>{{R}_{2}}\]
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