. One long wire carries a current of 30 A along the entire x axis. A second-long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?

magnitude of net magnetic field at given point is

Explanation:

As we know that magnetic field due to a long current carrying wire is given as

here we we will find the magnetic field due to wire which is along x axis is given as

r = 2 m

now we have

into the plane

Now similarly magnetic field due to another wire which is perpendicular to xy plane is given as

r = 2 m

now we have

along + x direction

Since the two magnetic field is perpendicular to each other

So here net magnetic field is given as

b) phosphorus pentoxide

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it