Two long straight wires are parallel and carry current in opposite directions. the currents are 8.0 and 12 a and the wires are separated by 0.40 cm. the magnetic field in tesla at a point midway between the wires is:

2 mT perpendicularly inwards to the plane of paper

Explanation:

i1 = 8 A

i2 = 12 A

Let 8 A is in upward direction and 12 A is in downward direction

The magnetic field at point P due to 8 A current

B1 = 8 x 10^-4 T Perpendicular inwards to the plane of paper

The direction of magnetic field is calculated by the Maxwell's right hand grip rule.

The magnetic field at point P due to 12 A current

B1 = 12 x 10^-4 T Perpendicular inwards to the plane of paper

The direction of magnetic field is calculated by the Maxwell's right hand grip rule.

Theresultant magnetic field at point P

B = B1 + B2 = ( 8 + 12) x 10^-4 = 20 x 10^-4 T

B = 20 x 10^-4 T = 2 mT perpendicularly inwards to the plane of paper

because it says use -2,0,and 2 for x, we can plug those numbers into the equation. y/4=3/4(-2)+2   y/4= -1 1/2 +2 now to get x by itself, we can multiply each side by 4. y=-6+8 which equals y=2 when x=-2. now you can do the same thing with 0 and 2 as x. you get y=8 when x=0 and y=14 when x=2.

x   |   y

-2 |   2

0   |   8

2   |   14

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.