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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > An electron with kinetic energy 2.5 ke V moving along the positive direction of an x axis enters a region in which a uniform electric field of magnitude 10 k V/m is in the negative direction of the y-axis. A uniform magnetic field B→ is to be set up to keep the electron moving along the x-axis , and the direction B→ of is to be chosen to minimize the required magnitude of B. In unit-vector notation, what B should be set up?

An electron with kinetic energy 2.5 ke V moving along the positive direction of an x axis enters a region in which a uniform electric field of magnitude 10 k V/m is in the negative direction of the y-axis. A uniform magnetic field B→ is to be set up to keep the electron moving along the x-axis , and the direction B→ of is to be chosen to minimize the required magnitude of B. In unit-vector notation, what B should be set up?

A proton of charge e and mass m enters a uniform magnetic field B= B i ^ with an initial velocity v =v x ​i ^+v y j ^. Find an expression in unit-vector notation for its velocity at time t.