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To understand what field is "real", write a charge equation of motion. The force in it is determined with the real field there. In a medium it is E: $m\vec{a} = q\vec{E}$. In case of magnetic field, it is $\vec{B}$ that determines the force: $m\vec{a} = q \vec{v} \times \vec{B}/c$.

To understand what field is "real", write a charge equation of motion. The force in it is determined with the real field there. In a medium it is still E: $m\vec{a} = q\vec{E}$. In case of magnetic field, it is $\vec{B}$ that determines the force: $m\vec{a} = q \vec{v} \times \vec{B}/c$.

To understand what field is "real", write a charge equation of motion. The force in it is determined with the real field there. In a medium it is E: $ma = qE$. In case of magnetic field, it is $B$ that determines the force: $ma = q V x B/c$.

To understand what field is "real", write a charge equation of motion. The force in it is determined with the real field there. In a medium it is E: $m\vec{a} = q\vec{E}$. In case of magnetic field, it is $\vec{B}$ that determines the force: $m\vec{a} = q \vec{v} \times \vec{B}/c$.

To understand what field is "real", write a charge equation of motion. The force in it is determined with the real field there. In a medium it is E: $ma = eE$. In case of magnetic field, it is $B$ that determines the force.

To understand what field is "real", write a charge equation of motion. The force in it is determined with the real field there. In a medium it is E: $ma = qE$. In case of magnetic field, it is $B$ that determines the force: $ma = q V x B/c$.