A transformer with 1000 turns on the primary coil is used to decrease the voltag

Question

A transformer with 1000 turns on the primary coil is used to decrease the voltage from 2000 V to 120 V home use. How many turns should be in the secondary coil? A) 60 turns B) 16 turns C) 125 turns D) 168 turns E) 4 turns Two convex thin lenses with focal length 13 and 14 cm, respectively, are aligned on a common axis, running left to right, the 13 cm lens being on the left. The lenses are separated by a distance of 20 cm. An object is located at a distance of 28 cm to the left of the 13 cm lens. Where will the final image appear as measured from the 14 cm lens? A) 30.333333 cm B) -6.5 cm C) 15.106 cm D) 19.292 cm E) 3.27 cm For a person with a Near Point (NP) - 85 cm. what would be his prescription's lens power = ________ diopters A) 2.824 diopters B) 0.68 diopters C) 1.789474 diopters D) 3.06 diopters E) 3.825 diopters For a diverging lens with one flat surface, the radius of curvature for the curved surface is 7 cm. What must the index of refraction be so that the focal length is -16.5 cm? A) 1.26789 B) 1.3 C) 1.424 D) 1.1246 E) 1.5015 A 2 cm tall object is placed along the principal axis of a thin convex lens of 30 cm focal length. If the object distance 35 cm, which of the following best describes the image distance and height, respectively? A) 210 cm and 12 cm B) 18.9 cm and 1.71 C) 70 cm and 0.786517 D) 28 cm and 1.61 E) 192 cm and 1.8 An ac series circuit contains a resistor of 460 ohms, an inductor of 3.2 H and a 9 mu F capacitor. If the frequency of the applied voltage is 115 Hz, what is the phase angle? A) 124.2 degree B) 77.97 degree C) 122.176 degree D) 46 degree E) 149 degree A given individual is unable to see objects clearly when he is beyond 80 cm. What power lens should be used to correct this problem? A) -1.25 Diopters B) -0.736 D C) -9.786408 D D) -0.84 D E) -3.137255 D

Explanation / Answer

14)

Given:

V1 = 2000V, V2 = 120V

N1 =1000, N2 = ?

We know, N1/N2 = V1/V2

=> N2 = N1(V2/V1) = 1000 (120/2000) = 60 turns (ans)-> option (A)

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