Version B PHY 202-01 Basic PhysicsII Due: July 24, 2018 Quiz 3 Student DScore Na

Question

Version B PHY 202-01 Basic PhysicsII Due: July 24, 2018 Quiz 3 Student DScore Name: (30 Points) Problem 1 The magnetic flux through one turn of a 50-turn coil is reduced by changin 2.010 Ox10 T in 5 ms. The coil is kept perpendicular to the magnetic field throughout the process. The average induced current in the coil is 3.5 mA. What is the total resistance of the wire? g the magnetic field from Pay attention to units] Problem 2 The secondary (output) coil of a 500-W ideal transformer has 400 turns, and an output voltage of 3600 V. How many turns in the primary coll (input) are needed if sneted to a 220-V source? What are (20 Points) the input and output currents?

Explanation / Answer

1. for one turn:

rate of change of flux = (2 - 1)(10^-3) Wb / (5 x 10^-3)s

= 0.2 Volt

and total induced emf = N (rate of change of flux)
= 10 Volt

and I = V / R

3.5 x 10^-3 A = 10 V / R

R = 2857 Ohm .....Ans

2. Np / Ns = Vp / Vs

Np / 400 = 220 / 3600

Np = 24 turns ....Ans

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