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In my textbook under the subtopic Similarities between biot-savart's law and Coulomb's law It is written that the magnetic field is linear in its source Idl , just as the electric field is linear in its source , the electric charge I'm unable to understand this point

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Linear means that if you consider a combination of sources such as $\alpha_1I_1+\alpha_1I_2$, you will obtain the corresponding combination of magnetic fields $\alpha_1B_1+\alpha_2B_2$.

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