Question

A proton of mass mp and charge e is in a box that contains an electric field E, and the box is located in Earth's magnetic field B.

Answer 1

Answer:

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Answer 2

Answer:

To find the direction of Electric field inside this box, and for the proton to be in a straight trajectory, the magnetic force must be balanced to the electric force. We can make use of the Right Hand Rule, as the positive charge gets moving up, hence the magnetic force points to the left, and the electric force needed for it should point to the right. Hence, for a positive charge, an Electric field towards the left will also make an electric force that will be directed to the left.