The example forced vibration is

Give one example of forced vibration.

(I) Air blown gently across the mouth of a bottle is an example for forced vibrations. (II) Oscillations of a coil in a galvanometer is an example for free oscillation of a coil in a galvanometer is an example for free oscillation. which one is correct statement ?

(A) : Resonance is a special case of forced vibration in which the natural frequency of vibrations of the body is the same as the impressed frequency and the amplitude forced vibration is maximum. (R) The amplitude of forced vibration of a body increases with an increase in the frequency of the externally impressed periodic force.

Assertion : Resonance is special case of force vibration in which the nature frequency of vebration of the body is the same as the impressed frequency of external periodic force and the amplitude of force vibration is maximum Reason: The amplitude of forced vibrations of a bodyincrease with an increase in the frequency of the externally impressed perioic force

Assertion : Resonance is special case of force vibration in which the nature frequency of vebration of the body is the same as the impressed frequency of external periodic force and the amplitude of force vibration is maximum Reason: The amplitude of forced vibrations of a bodyincrease with an increase in the frequency of the externally impressed perioic force