Uploaded imagetwo long, parallel wires each carry the same current i in the same direction (see figure below). the total magnetic field at the point p midway between the wires is in what direction?

a. zero
b. directed into the page
c. directed out of the page
d. directed to the left
e. directed to the right

Zero

Explanation:

Two long parallel wires each carry the same current I in the same direction. The magnetic field in wire 1 is given by :

Magnetic force acting in wire 2 due to 1 is given by :

Similarly, force acting in wire 1 is given by :

According to third law of motion, the force acting in wire 1 will be in opposite direction to wire 2 as :

So, the total magnetic field at the point P midway between the wires is in what direction will be zero as the the direction of forces are in opposite direction.  

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explanation:

the closer the planet is to the sun, the larger the gravity