Question

Cultiple Choice (6 pts each) The closed circuit shown at right carries a current: 154, where a=0.10 m and b=0.20 What is the magnitude and direction of the magnetic field at point P? Magnitude a) 7.07 x 10-51 b) 2.36 x 10-5T c) 7.07 x 10-5T d) 2.36 Tx 10-5 Direction Into the page Into the page Out of the page Out of the page 2. The figure shows, in cross section, three conductors that carry currents perpendicular to the plane of the figure. If the currents I, I, and I all have the same magnitude for which path(s) is/are the line integral of the magnetic field equal to zero? a) path a only b) paths b and d c) paths a and c d) paths a, b, c, and d e) depends on whether the integral goes clockwise or counterclockwise mund tie pati --- 3. The figure shows a bar magnet moving vertically upwardi toward a horizontal coil. The poles of the bar magnets are labeled X and Y. As the bar magnet approaches the coil it induces an electric current in the direction indicated on the figure (counter-clockwise as viewed from above). Wiat are the correct polarities of the magnet? a) X is a north pole, Y is a south pole. b) X is a south pole, Y is a north pole. c) Both X and Y are south poles. d) Both X and Y are north poles. e) The polarities of the magnet cannot be determined from the information gwen.

Answer 1

ALUTALII Magnetic field at 'p = lo I Hot 4 r (6) 2012(a) = 2x107x Is L 12 B =tal. Sx10-5T B2 2.36x105T into the o page o optim-B 3 B. dL for Mo EI for a &I=0 ande o options