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Q.

Configuration of L shaped block and two other blocks are shown. System is set free to move. At any moment, match the following parameters.
 (g = 10 m/s2)

Question Image

Column 1   Column 2
 (1)     Friction force between block A and B(p)     50 N
(2)     Tension in string (q)     70 N
(3)     Normal reaction on block A by block B  (r)      20 N 
(4)     Normal reaction on block B by table (s)      10 N

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a

1S, 2P, 3 Q, 4R

b

1S, 2P, 3R, 4 Q

c

1P, 2 S, 3 R, 4 Q

d

1P, 2S, 3Q, 4 R

answer is B.

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Detailed Solution

Horizontal acceleration of 4 kg & 6 kg = g/2 = 5 m/s2.
Normal between 4 & 6 is 4a = 20 N.
Maximum friction between 4 kg & 6 kg is µN = 10 N upwards.

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