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Question
If an electric field \[\vec{E}\] is also applied such that the particle continues moving along the original straight line path, what should be the magnitude and direction of the electric field \[\vec{E}\] ?
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Solution
The direction of the magnetic force is along negative Y-axis and so, the direction of electric force should be along the positive Y-axis to counter balance the magnetic force and charge particle will move in the straight line path.
Therefore, the direction of electric field is along the positive Y-axis and its magnitude is given by E = vB
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