\( \mathrm{P} \) Given in the figure are two blocks A and B of weig...

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\( \mathrm{P} \)
Given in the figure are two blocks A and B of weight \( 20 \mathrm{~N} \) and \( 100 \mathrm{~N} \), respectively. These are being pressed against a wall by a force \( \mathrm{F} \) as shown. If the coefficient of friction between the blocks is \( 0.1 \) and between block \( B \) and the wall is \( 0.15 \), the friction force applied by the wall on block \( B \) is :
(A) \( 120 \mathrm{~N} \)
(B) \( 150 \mathrm{~N} \)
(C) \( 100 \mathrm{~N} \)
(D) \( 80 \mathrm{~N} \)
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