Question

At time ti, an electron is sent along the positive direction of an x axis, through both an electric field E and a magnetic field B with E directed parallel to the y axis. The figure gives the y component Fr of the net force on the electron due to the two fields, as a function of the electrons speed v at time ti. The scale of the velocity net,y axis is set by v 95 m/s. The x and z components of the net force are zero at ti. Assuming Bx o, find (a) the magnitude of the electric field and (b) B in unit-vector notation.

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