An observer A and a charge Q are fixed in a stationary frame $F_{1}$ . an observer B is fixed in a frame $F_{2}$ , which is moving with respect to $F_{1}$ :

both A and B will observe electric fields

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both A and B will observe magnetic fields

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neither A nor B will observe magnetic fields

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B will observe a magnetic field, but A will not

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Solution

The correct options are
A both A and B will observe electric fields
D B will observe a magnetic field, but A will not
An observer A and a charge Q are fixed in a stationary frame F1 hence, he will observe an electric field only. Since, an observer B is fixed in a frame F2, which is moving with respect to F1 , B will observe electric field due to charge in frame F1 and magnetic field due to motion of frame F2.

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An observer A and a charge Q are fixed in a stationary frame F1. an observer B is fixed in a frame F2, which is moving with respect to F1 :

An observer A and a charge Q are fixed in a stationary frame $F_{1}$ . an observer B is fixed in a frame $F_{2}$ , which is moving with respect to $F_{1}$ :