First slide

Damped and forced oscillations

Question

Amplitude of a wave is represented by $A = \frac{c}{a + b - c}$ .Then resonance will occur when

Moderate

A

$b = - c / 2$
B

b = 0 and a = c
C

$b = - a / 2$
D

None of these

Solution

$A = \frac{c}{a + b - c};$ when $b = 0$ , $a = c$ amplitude
$A \to \infty$ . This corresponds to resonance.

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