What is the resonance frequency? 35 Hz 30 Hz, 26 Hz. 20 Hz 16 Hz An object is pl

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

Explanation / Answer

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

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