question_answer

Which part represents the negative dynamic resistance?

A) AB                   

B) BC    

C) CD                   

D) DE

Correct Answer: C

Solution :

[d] \[{{f}_{o}}=240Hz{{f}_{o}}=24Hz\] \[{{f}_{1}}={{f}_{o}}-\left[ \frac{v}{v-{{v}_{{{s}_{1}}}}} \right]{{f}_{2}}={{f}_{o}}-\left[ \frac{v}{v-{{v}_{{{s}_{2}}}}} \right]\] \[{{f}_{1}}=\frac{240\times 320}{320-4}{{f}_{2}}=\frac{240\times 320}{320-4}\] No. of beats \[={{f}_{1}}-{{f}_{2}}=0\]