Four pendulums A,B,C and D are suspended...

Four pendulums A,B,C and D are suspended from the same elastic support as shown in figure. A and C are of the same length , while B is smaller thatn A and D is larger than A. If A is given a transverse displacement,

All the four pendulums will oscillate with equal amplitudes

B will oscillate with maximum amplitude

C will oscillate with maximum amplitude

D will oscillate with maximum amplitude

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The correct Answer is:

Pendulums A and C have the same lengths.
`because T=2pi sqrt((l)/(g))`,
They will have the same period and same frequency. Due to this, there will be resonance and the pendulum C will start oscillating with the maximum amplitude.

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