1. An ideal transformer steps 8.0 V up to 2000V and the 6000 turn secondary coil
ID: 1266051 • Letter: 1
Question
1. An ideal transformer steps 8.0 V up to 2000V and the 6000 turn secondary coil carries 2.00A.
A) Find the number of turns on the primary.
B) Find the current value in the primary.
C) What is the power of this transformer?
2. An unpolarized laser has an average power of 1.200 mW. At a distance of 8.00 m it forms a circle with a diameter of 1.50 mm.
A) Assuming the entire average power of the laser is within the circle of light, what is the intensity of the laser light? Note that the laser does not send the energy in all directions.
B) Find the average energy density of the laser light. Hint: relates to intensity.
C) Find the RMS electric field value of this light.
D) Find the RMS value of the magnetic field value for this light.
E) How long does it take the light to travel the 8.00 m?
F) If the laser light wavelength is 656 nm, what is the frequency?
3. A metal bar of lenght 0.50 m moves in a region of constant magnetic field. The field is into the paper and has a magnitude of 250mT. (L=0.50m, V=3.0 m/s, R=10.0 Ohms)
A) What is the induced Emf?
B) What is the current?
C) What is the direction of the current? (CW or CCW)
D) What force (magnitude and direction) is required to maintain the 3.0 m/s velocity?
Explanation / Answer
8/2000 = Np / 6000
Np = 24
number of turns on the primary = 24
8 * Ip = 2000 * 2
Ip = 500 A
current value in the primary = 500 A
power = Vp * Ip
power = 8 * 500
power = 4000 watt
power of this transformer = 4000 watt
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