• CHAPTER27 The figure shows a portion of a silver ribbon with z 1 = 11.8 mm and y 1 = 0.23 mm , carrying a current of 120 A in the +x-direction. The ribbon lies in a uniform magnetic field, in they-direction, with magnitude 0.95 T. Apply the simplified model of the Hall effect. If there are 5.85x1028 free electrons per cubic meter, a) Find the magnitude of the electric field in the zdirection due to the Hall effect. b) Find the direction of the electric field in the zdirection due to the Hall effect. c) Find the Hall emf. y X - .- . --- - (4. lfZit/0 -:iz.) (a_ crq-r)_7f . ~~XIO 7:?(-/~b'_f'ti'1j) 7 b) i 5';.,.. £~ c) lid U!t>i¥- e == o!M- jN.r)-Hve 1 · - _. J.H&.fiovt ;: {'f.lfq~J . /f~S X!O-:rn/ ----- ~ -· _,.. . 0~--~-+ 4~ tf I liD ;;, E:~ 'c, .&ttx;o->v ·-··- . ,J @ . I . • CHAPTER28 Two long, parallel wires carry currents I 1 and 12 in opposite directions, as shown. How large should 12 be in order for they component of magnetic field to be zero at the point P = (2d, d)? (Your answer should be. an expression involving/~, d, and (possibly) the magnetic constant flo·) l( p T d • • U/\ = l ---··.--.···.· .. -············-··--·------;----;... . [ I, ---···-~----• . ce ... -··- .. . cz:r,j -· --~·· -