MULTIPLE CHOICE 4) The coil of a generator is rotated twice as fast keeping all

Question

MULTIPLE CHOICE 4) The coil of a generator is rotated twice as fast keeping all other factors constan the value of the maximum induced emf? t. What happens to 4) A) It is reduced by a factor of 2. B) It is increased by a factor of 4. C) It stays the same. D) It is increased by a factor of 2. E) It is reduced by a factor of 4. 5) A constant magnetic field of 0.50 T is applied to a rectangular loop of area30 x 10-3 m2. If the area 5) of this loop changes from its original value to a new value of 1.6 10-3 m2 in 1.6 s, w ncedin the loop? 3 m2 in 1.6 s, what is the emf A) 0 V B) 9.0 × 10-2 V C) 1.6 x 10-2 v D) 7.5 x 10-2 v E) 4.4 x 10-4 v 6) The primary coil of a transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil? A) 30 V 1o B) 70 V D) 400 V E) 480 V C) 100 V 7) A y-V rms voltage at 90 Hz is applied across a 20-uF capacitor and a 100-2 resistor. What is the C) 0.8 A rms value of the current in that circuit? A) 1.0 A B) 0.6 A D) 0.7 A E) 0.9 A 8) A 500-mH inductor is connected in series with a 2500-? resistor. What is the phase angle at 3000 C) 75.9 9) Which of the following represents the maximum value of the magnetic field at a distance of 2.5 m Hz? A)-20.7 B)-75.9 D) 90.0° E) 20.7? from a 100 W light bulb? A) 0.10 HT B) 0.60 uT C) 0.40 HT D) 0.50 AT E) 0.80 HT

Explanation / Answer

Problem 5)

Given,

Magnetic field(B) = 0.50 T

Change in the area (dA) of rectangular loop = 3.0*10-3m2 -1.6*10-3m2

Time interval, (dt) = 1.6 s

Now the formula for the emf induced in the coil is,

E = B dA/ dt

E = 0.5*(3-1.6)*10^-3/1.6 = 0.0004375 = 4.4 x 10-4 V

So correct answer is option (E)

According to Chegg guidelines I can answer one question at a time, so please post other questions separately

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