Consider a pulse created on the horizontal string highlighted. The net force applied by particles A and C on B will be in
A
upward direction
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B
downward direction
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C
left direction
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D
right direction
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Solution
The correct option is B downward direction
From figure, we can see that particle B is at extreme position. So, particle B will try to pull particle A and C to the extreme position.
Hence, by Newton's third law of motion, particles A and C will pull particle B in the opposite direction as shown in figure. Net force on particle B will be downward.
Thus, option (b) is the correct answer