Question

A 2mm long wire carries a current of 0.5A directed out of the page. The magnetic field due to this bit of wire at a point P which is 3 meters to the right of and 3 meters lower than the wire (see the figure below) is

a)5.56 x 10^-12 T pointing upwards 45 degrees to the right

b)5.56 x 10^-12 T pointing downwards 45 degrees to the left

c)3.93 x 10^-12 T pointing upwards 60 degrees to the right

d)3.93 x 10^-12 T pointing downwards 30 degrees to the left

A 2mm long wire carries a current of 0.5A directed out of the page. The magnetic field due to this bit of wire at a point P which is 3 meters to the right of and 3 meters lower than the wire (see the figure below) is a. 5.56 x 10-12T pointing upwards 45 degrees to the right b. 5.56 x 10-12T pointing downwards 45 degrees to the left c. 3.93 x 10-12T pointing upwards 60 degrees to the right d. 3.93 x 10-12T pointing downwards 30 degrees to the left LLLLLLLL 3m 0.5A 3m

Answer 1

i= current in wire = 0.5 A L = length of wire =2m = 2x 10^-3 m r = distance of wire from point P = 32 +32 = 312 3 magnetic field due to wire = 8 - Ho iCL) in = (10-7)(0.5) (2x1043) (18) = 5.56 X10-12 a)5.56 x 10^-12 T pointing upwards 45 degrees to the -LE