A transformer change the 10.000 power line to 120 v.If the primary coil contains

Question

A transformer change the 10.000 power line to 120 v.If the primary coil contains 750 turns. how many turns are on the secondary? 0 2.1 times 10^4 6.3 times 10^4 3 9 A 500-W device is connected to a 100 v power source. 50,000 A 1.60 times 10^18 electrons/s 20.0 A 5.00 A 200 mA A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image? 20 cm behind the mirror 20 cm in front of the mirror 25 cm behind the mirror 100 cm in front of the mirror 25 cm in front of the mirror A 4.0 mu F capacitor is connected in series with a 2.0 k ohm resistor across a 20-v DC source and a switch. What is the time constant of this RC circuit? 18 ms 40 ms 12 ms 9.0 ms 80 ms

Explanation / Answer

12 )

i = 40o , n2 = 1.33

using snell's law

n1 sini = n2 sinr

r = 28.9o or 29o

option A correct

13 )

v = c / n

v = 3 X 108 / 1.4

v = 2 X 108 m/sec

option E correct

14 )

V2 / V1 = N2 / N1

N2 = 750 X 120 / 10000

N2 = 9 turns

option E correct

15 )

current i = P . V

i = 500 / 100

i = 5 A

option D correct

16 )

f = - 20 cm

u = -100 cm

1 / f = 1 / u + 1 / v

1 / v = - 1 / 25

25 cms infront of the mirror

option E correct

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