Question

long, paralle conductors carry equal 3 A currents,oriented at the corners of a square with sides of length of 0.2 m. A cross- sectional view of the conductors is shown. The current direction is out of the page at points indicated by the dots and into the page at points indicated by the crosses. A D Ay 3 AO 03 A IP 3 A 3 A BK 0.2 m С Which diagram correctly denotes the direc- tions of the components of the magnetic field from each conductor at the point P? The per- meability of free space is 4 x 10-7 T.m/A.

Answer 1

Use equation for magnetic field due to long current carrying wire and right hand thumb rule to find the required magnitude and direction of field as shown below

ņ y 1 A 6 BC BA » X Bo BB B С Using right hand thumb rule we conclude that correct ophon is, 4 as shown above in figure. 2 ) 11Ball 2 MoT 2īr o = I sa fe= side Llength. 2 = Mo I 1) Mo 2īl 21/152 (0532) B2 12 BAT Bc Mol + Mo = 2BA złe Słe Similarly B2 = B₂ t Bo = Mo I złI + Л% Т Sł é = 2BA Now, angle between By and B2 is 90° So resultant Buat = SB, ² + B² 2 = S(2BA) +(284) 2 = 2-82843 3||Ball