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Radius of orbit of electron; required electric field strength;

An electron enters a uniform magnet field having a flux density 200uT at a speed of 2x10 6 ms-1 perpendicular to the field. Determine the radius of its orbit, then find the required electric field strength, applied perpendicular to the magnetic field, if the electron is to be continue in a straight line on entering the combined fields, and sketch it?

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centripetal force = force due to magnetic ...

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The solution shows all the formulas used in calculating the answers.