1. A flat, rectangular coil measuring 0.10 m by 0.20m and containing 100 turms o
ID: 1731874 • Letter: 1
Question
1. A flat, rectangular coil measuring 0.10 m by 0.20m and containing 100 turms of wire is rotating at a constant speed of 100m rad/s in a magnetic field of 0.20 T. The maximum EMF induced in this coil is approximately A) 126 V B) 63 V C) 1.0 V D) 10 V E) 44 V 2. Which of the following statements is true? A) ) C) Electromagnetic waves are longitudinal waves. The electric and magnetic fields are out of phase in an electromagnetic wave. The electric- and magnetic-field vectorsE and B are equal in magnitude in an electromagnetic wave Maxwell's equations apply only to fields that are constant in time. None of these statements is true. D) E) 3. How much does the maximum EMF produced by a generator (a rotating coil) change if the number of turns of the coil is tripled? A) B) C) D) E) it is impossible to tell given the information provided it is reduced by one-third it is the same it is increased by a factor of nine it is tripled 4. Light that has been traveling in a medium with an index of refraction n2 is incident the boundary surface of another medium with an index of refraction ni. Given a sufficient angle of incidence, which of the following conditions must be satisfied f total internal reflection to occur? A) ni> n2 B) nin2 C) Any of these may be correct. D) nin2 E) None of these is correct.Explanation / Answer
1) Solution
Number of turns N=100 turns
Angular velocity W=314 rad/s
Magnetic field B=0.2 T
Area A=0.02 m^2
The maximum EMF
basing on electromagnetic induction
=>maximum EMF=NBwA
=100*0.2*0.02*314
=125.6 v
=126 v
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