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A magnetic field is defined as a location in space near a magnet or an electric current, the further paragraph explains the magnitude.
What is a magnetic field?
A magnetic field is defined as a location in space near a magnet or an electric current where a physical field is formed by a moving electric charge exerting force on another moving electric charge. The Earth's magnetic field is an example of a magnetic field.
Since either 0o or 180o and due to a semi-circular arc are equal and opposite, the magnetic field due to straight wires AB and CD is zero; thus, the net field at O is zero.
Learn more about the magnitude of the magnetic field here:
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