Question

The sharpness of resonance in a series $L-C-R$ resonant circuit, as the resistance of the circuit is increased, goes on

• A. increasing
• B. decreasing
• C. tends from zero to infinity
• D. tends from infinity to zero

Answer 1

Answer: (B)

decreasing

At resonance impedance becomes equal to $R,$ therefore when we increase $R$ the current flowing at the time of resonance decreases and therefore the sharpness of curve too decreases