A conducting wire is 1.50 m long. An emf (E) is induced in a conducting loop of

Question

A conducting wire is 1.50 m long. An emf (E) is induced in a conducting loop of wire 1.50 m long as its shape is changed from square to circular. 20. What is the area of the 1.50 m circumference circular coil? A)2.25 m2 B)1.500 C)0.998 D)0534 E)0.179 F)oos17 21. Find the change in the magnetic flux if the local 0.65-T magnetic field is redcular to the plane of he loop. A)0.0059 Tm? B)0.0188 Tm? C)0.0488 T D) 0073 1 T-m? E)0095 1 T. F)0.119 T 22. Find the average of the induced emf (8) if the change in shape occurs in 0.250 s A)-0.476v B)-0.299 v C)-0.035 v D) +0.051 v E) +0.166v F)+0.585 v

Explanation / Answer

20) E) 0.179 m^2

2pi*r = 1.5 m

r = 1.5/(2*pi)

A = pi*r^2

= pi*(1.5/(2*pi))^2

= 0.179 m^2

21) Answer is not in the given options

A2 = 0.179 m^2

A1 = (1.5/4)^2 (Area of square)

= 0.1406 m^2

change in magnetic flux = B*(A2 - A1)

= 0.665*(0.179 - 0.1406)

= 0.0255 T.m^2

22) Answer is not in the given options

Average induced emf = change in megnetic flux/time taken

= 0.0255/0.25

= 0.102 V

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