5) In a primary coil, the current (1) is initially 3.4 A. After a tine t1) of 0.

Question

5) In a primary coil, the current (1) is initially 3.4 A. After a tine t1) of 0.14s, the curent will change to 1.6 A. a) What is the mutual inductance (M) of the conls, if the enf () hat is induced in the secondary coil is 0.12 v? 6) Diverging Lens 7) The focal point of a thin diverging lens -22 2 em from the center of lens. A real object is placed 4950cm from the lens a) Find the image distance (d.) in em. b) Provide the work to prove the image is Real or imaginary? c) Show the work to prove if this image is upright and inverted d) Show the word that proves the image is Enlarge, the same size or Reduced

Explanation / Answer

magnetic flux in secondary coil , phi = M*I

induced emf = rate of change in flux emf = -M*dI/dt

dI = change in current I2 - I1 = 1.6-3.4 = -1.8 A

dt time interval = 0.14 s

M = mututal inductance

emf = 0.12 V

M = emf*dt/dI

M = 0.12*1.8/0.14

M = 1.542 H

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6)

object distance do = 4950 cm

focal length f = -22.2 cm

image distance di = ?

1/do + 1/di = 1/f

1/4950 + 1/di = -1/22.2

image distance di = 22.2 cm

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(b)

image distance is negative

image is imaginary

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c)

magnification m = -di/do = 20.1/4950 = 0.004

m is positive

image is upright

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d)

m < 1

the image is reduced

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