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Δ = displacement caused when force is increased by a small amount
P = external force applied
N = internal force in the member force applied
L = length of member
A = cross-sectional area of member
E = Modulus of elasticity
Same symbol is used for partial and total differentiation and they are pretty obvious.
 N is caused by:- 
  • a)
    constant forces
  • b)
    variable forces
  • c)
    both
  • d)
    neither
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Δ = displacement caused when force is increased by a small amoun...
Answer: c
Explanation: It is caused by both the constant external force and variable P.
A beam has been subjected to gradually applied load P1 and P2 causing deflection Δ1 and Δ2.
Gradual increase of dp1 causes subsequent deflection of dΔ1 and dΔ2.
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Δ = displacement caused when force is increased by a small amountP = external force appliedN = internal force in the member force appliedL = length of memberA = cross-sectional area of memberE = Modulus of elasticitySame symbol is used for partial and total differentiation and they are pretty obvious.N is caused by:-a)constant forcesb)variable forcesc)bothd)neitherCorrect answer is option 'C'. Can you explain this answer?
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