Question

A closely wound, circular coil with radius 2.60 cm has 800 tums. Part A What must the current in the coil be if the magnetic field at the center of the coil is 0.0790 T? Express your answer to three significant figures and include the appropriate units. I - 4.09 A Previous Answers ✓ Correct Part B At what distance from the center of the coil, on the axis of the coll, is the magnetic field half its value at the center? Express your answer to three significant figures and include the appropriate units. O O O ? I = Value Units Submit Request Answer

Answer 1

sol radius r= 2.60cm = 0.026 m N= 800 turns B = 0.0790 T - * the magnetic field Be Mont current . ZBY - Ūo 2x (0.0790T) (0.026 m) (ARXjó? Tm ) (800) I = 4:09 A 1. the magnetic field half its value at the center Be = ( MoŅI) 28 the magnetic field at the center of the coil Mon Ir? Be = 2 (2+0753 20 MNI 2 I MONI O IN zr = 2(28+823% 2x2 = (*+ough (28335 = x++o [2(0.026msa)"= x++ (0.026) 0.02 26 = 0.01993 m