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Q.

The resulting amplitude A' and the phase of the vibrationsS = A cos(ωt) + A2cos(ωt+π2)+A4cos(ωt+π)+A8cos(ωt+3π2) = A'cos(ωt+δ)then A' and δ are respectively.

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a

58A, tan-1(12)

b

358A, tan-1(12)

c

358A, tan-1(14)

d

38A, tan-1(14)

answer is B.

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Detailed Solution

tan θ = 12Anet = (3A4)2+(3A8)2 = 3A41+(12)2 = 358A
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