An infinitely long straight wire is carrying current I and another wire which is parallel to the first wire , is carrying current $$2I$$ in the same direction.The wires produce a magnetic field B at the midpoint. What will be the field when $$2I$$ wire is switched off?

Question

An infinitely long straight wire is carrying current I and another wire which is parallel to the first wire , is carrying  current $$2I$$ in the same direction.The wires  produce a magnetic field B at the midpoint. What will be the field when $$2I$$ wire is switched off?

Infinity Learn · Accepted Answer

When two parallel conductors carrying current I and $$2I$$ in same direction, then magnetic field at the midpoint $$isB=$$μ$$02I2$$$$π$$r −  μ$$0I2$$$$π$$r $$=$$ μ$$0I2$$$$π$$$$r(Directed$$ $$upwards)When$$ current $$2I$$ is switched off, then magnetic field due to conductor carrying current I is $$B=$$ μ$$0I2$$$$π$$$$r(Directed$$ $$downwards)$$

An infinitely long straight wire is carrying current I and another wire which is parallel to the first wire , is carrying current 2I in the same direction.The wires produce a magnetic field B at the midpoint. What will be the field when 2I wire is switched off?

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