Q.

Amplitude of a wave is represented by  A=ca+b−c.Then resonance will occur when

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a

b=−c/2

b

b = 0 and a = c

c

b=−a/2

d

None of these

answer is B.

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Detailed Solution

A=ca+b−c; when b=0,  a=c amplitudeA→∞ . This corresponds to resonance.
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Amplitude of a wave is represented by  A=ca+b−c.Then resonance will occur when