Resonance only occurs in a free vibrating system B A harmoni

Resonance only occurs in a free vibrating system. (B) A harmonic force is one where the magnitude of the force is always constant. (C) The amplitude of vibration is independent of the static deflection of the system. (a) Statements (A) and (C) only are correct. (b) Statement (A) only is correct. (c) None of the statements is correct. (d) Statements (B) and (C) only are correct. (e) Statement (C) only is correct.

Solution

only statement c is correct

A harmonic force magnitude is the restoring force which is directly proportional to the amplitude from the equilibrium

resonance can occur even in the externally forced systems, damped systems also