# Two long, parallel transmission lines, 4.0 cm apart, carry1.0-A and 3.0-A currents. Find all locations where the net magnetic fieldof the two wires is zero if these currents are in (a) the same directionand (b) the opposite direction.

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Two long, parallel transmission lines, 4.0 cm apart, carry
1.0-A and 3.0-A currents. Find all locations where the net magnetic field
of the two wires is zero if these currents are in (a) the same direction
and (b) the opposite direction.

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Step 1

Figure shows the two long parallel transmission lines 4 cm apart carrying i1 and i2 currents. Let x be the distance from i1 conductor.

Step 2

Here, µo is the permeability of free space, i is current and r is distance from the conductor to imagined point. Magnetic field (B) due to a straight wire, is given by

Step 3

Part(a)

Let at distance x from a 1 A wire, the net magnetic field is zero if currents in the ...

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### Magnetic Effects of Current 