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Question

"As the electrons move relative to protons (ions) there is a relativistic charge per unit volume difference between the positive and the negative charges. This causes any external charges to feel a force we know as the magnetic field."

Please Explain this sentence......

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Solution

Dear friend,

The sentence means that:
When the protons is fixed at a postion and electrons moves with respect to the fixed position of protons an Electric field is produced (due to flow of charges)

According to Faraday's law change in electric field causes magnetic field.

​​​​​​
Thus the sentence means that an electron flow which causes change in electric field leads to the production of magnetic fielad

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