The diagram at the right shows the cross sectional view of t

The diagram at the right shows the cross sectional view of two wires, each carrying equal amounts of current out of the page. On the diagram, draw and label an arrow to represent the magnetic field created by current 1 at point P. Explain your answer in the space below. On the diagram, draw and label an arrow to represent the magnetic field created by current 2 at point P. On the diagram, draw and label an arrow to represent the total magnetic field at P. A third wire, also carrying current out of the page, is now placed at point P. On the diagram at the right, draw an arrow to represent the force exerted by the total magnetic field on current 3. Explain your answer in the space below.

Solution

A) total magnetic field at P due to both the wire is ZERO.
This is because from the right hand thumb rule, the magnetic field at P due to current 1 (upwards) and current 2 (downwards) are in opposite direction. Also, since their distances from P are also same, they cancel out each other.

B) Forece on current 3 due the the other currents is also ZERO. as the resultant magnetic field due to the two currents at the centre (P) is zero.