Three long wires all lie in an xy plane parallel to the x axis. They intersect the y axis at the origin, y = d, and y = 2d, where d = 10 cm. The two outer wires each carry a current of 6.8 A in the positive x direction.

1. What is the magnitude of the force on a 2.8 m section of either of the outer wires if the current in the center wire is 3.3 A.

(a) in the positive x direction and (b) in the negative x direction?

F =

Explanation:

The magnetic field due to the first wire can be written as:

The magnetic field due to the second wire is as follows:

The net magnetic field B =

Also; the magnetic force on wire segment  l = 2.8 m

Replacing all the values ; we have :

b)

Magnetic field due to the first wire is :

Magnetic field due to the second wire is :

Net magnetic field B =

B =  

B =

Magnetic force F =

F =  

F =

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when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.