# Biot-savart's law for magnetic field

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

## 1 Answer

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 $$\alpha_1B_1+\alpha_2B_2$$.