Question

Physics 2 lab. Quiz 7 St. Name: St. ID:---- Select the correct answer out of the four suggested answers following the statements. 1 - Which of the following is a unit of magnetic permeability u? a- mT/A b-T.cm/A - T/A - NA 2. A circular loop of wire 1.0 cm in radius carries a current of 30 A. The magnetic field at the center of the foop is a) 1.9 mt, b) 2.4 mt. c) 3.8 mt. d) 4.8 JT. e) 48 uT 3- A magnetic field line is used to find the direction of a) south-north, b) a bar magnet, c) a compass needle, d) magnetic field 4.The magnetic field at a distance 2 cm from a long straight current-carry wire is 210T. The current in the wire is :- a) 0.16A b) 1.0A c) 2.0Ad)4.04 ) 25A The magnetic field at a distancer from a long wire carrying current I is 0.4 Tesla. The magnetic field at a distance 2r is? a) 0.2T ,b) 0.8T, c) 0.IT, d) 16T

Answer 1

magnetic filed at distance r from long straight wire is

B=$\frac{\mu _{o}I}{2\pi r}$

0 unit of mafuelic Permectility u=N/A Tel.ocm =.1.6x10m 1 - 30 A Magnetic field at the center of loop. HAX B: 47x157 B = 48X57 v iewton 2*10X162 Toxio-I 60 x 3.148 X 107 X10 - 188.4 x105 = 1-88x10-5xlo =1.0 x103 7 = 1.9 mT magnetic field at the center of loop B = remo] a magnetic field line is used to find the direction of magnetic fieed 3 G razem - 2x10²m .B=2x1657 from long Magnetic field at distances straight currut Carry wire. 2AY 2x185 - yax107x i ижx4 хон 28105 = ixlotx10² 2x105 = ixios 2x155 2x105x105 = 2.0 A current in the wire i= 2.0 al

© T=r. B, = 0.4 Tesla 22Y >2r, Biz? - megetic fiend at distencer from long wire Ba Motor Hew. B*+1 B, = 0X* 09= 0.2 Tesla. Mafutic tiched at distance or is (B=0.27)