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Forces of 3 N and 4 N act at right angles on a particle. What third force keeps it in equilibrium?
A7 N
B5 N
C1 N
D12 N
Answer & Solution
Correct answer: B. 5 N
For equilibrium the third force must cancel the resultant of the other two, whose magnitude is the square root of 9 + 16, which is 5 N.
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