are line switch initially ,us in . T he s, closed, is opened. The polarity of 25
ID: 1583432 • Letter: A
Question
are line switch initially ,us in . T he s, closed, is opened. The polarity of 25) duced emf in terminals X and Y is AY is positive and X is negative X and Y are at the same potential C) X is positive and Y is negative A 5 meter length of wire carrying a current of S A lies on a horizontal table with a rectangular top 26) of dimensions 0.300 mx0.400 m. The ends of the wire are attached to opposite ends of a diagonal of the rectangle. A vertical magnetic field of 0.30 T is present. What magnetic force acts on this segment of wire? A) 1.7 N B) 12 N C) zero D) 1.2N E) The force cannot be determined without knowing the shape of the length of wire. 7) The speed of light in a material is 0.55 c. What is the critical angle of a light ray at the interface 27) between the material and a vacuum? A) 30 B) 27 C) 23 D) 33 The energy flow per unit time per unit area (S) of an electromagnetic wave has an average value of 28) 844 mW/m2. The maximum value of the magnetic field in the wave is closest to: A) 4.20 10-8 T B) 8.41 10-8 T C) 1.68× 10-7 T D) 1.16 10-7T E) 5.95 × 10-8 TExplanation / Answer
26. When a rectangular current carrying loop is placed in a magnetic field then the force acting on the respective opposite sides of rectangle is equal and directed oppositely, hence no net force is observed on the loop due to magnetic field.
Option (c) is correct.
27. n= c/(0.55c)= 1.82
Critical angle,
sin ic= 1/n
ic= 33
28. Em= (2*0.844*4*3.14*10-7*3*108)0.5= 25.22 N/C
Bm = Em/c= 8.41*10-8 T
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