Answers
here ,
the diameter of loop , d = 10 cm
radius , r = d/2 = 5 cm = 0.05 m
resistance , R = 800 mohm = 0.8 ohm
potential difference , V = 12 V
a)
the current in the wire , I = V/R
I = 12 /0.8 A = 15 A
the direction of current is CLOCKWISE
b)
the magnitude of field at the center , B = u0 * I /( 2 * r)
B = 1.26 * 10^-6 * 15 /( 2 * 0.05)
B = 1.89 * 10^-4 T
using right hand thumb rule
the direction of field is Into the page
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