Question

What is the resonance frequency? 35 Hz 30 Hz, 26 Hz. 20 Hz 16 Hz An object is placed 20 cm far from a convex lens whose focal length is 10 cm. What is the image distance? 5 cm 10 cm 15 cm 20 cm none What is correct KVL equation for the outer loop a-c-d-f-a? 3I_1 + 9I_3 + E_1 - E_2 = 0 3I_1- 9I_3 + E_1 + E_2 = 0 3I_1 + 9I_3 - E_1 + E_2 = 0 3I_1 + 9I_3 + E_1 + E_2 = 0 3I_1 + 9I_3 - E_1 - E_2 = 0 A small bicycle generator has 150 turns of wire in a circular coil of radius 1.8 cm. The magnetic field is 0.2 T. If induced voltage amplitude is 12.6 V, what is the rotational speed in r.p.m ? 125 137 150 275 413

Answer 1

32 . # 31 is missing. so cannot calculate resonant frequency

33.f = 10 cm
Do = 20 cm

1/f = 1/Do + 1/Di

1/Di = 1/f - 1/Do = 1/10 cm - 1/20 cm

so Di= 20 cm

34. d is answer