Two long wires, left of which has a semicircular bend of radius R, are positioned as shown in the accompanying figure. The left wire with the semicircular bend carries a current I1, the right wire carries a current I2. How far apart in m must their parallel sections be so that the net magnetic field at P is zero?
A circuit with current "I" has two long parallel wire sections that carry current in opposite directions. Find the magnetic field at a point P near these wires that is a distance "a" from one wire and "b" from the other wire as shown in the figure.
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