A-level Physics · Magnetic fields

Path of a charged particle

Use r = mv/BQ for an electron or proton moving at right angles to a field, or after a pd.

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Question 1

An electron moves at 5.8×1065.8 \times 10^{6} m s⁻¹ at right angles to a uniform magnetic field of flux density 5.0 mT. Calculate the radius of the circular path of the electron, in mm. Use e = 1.60×10−191.60 \times 10^{-19} C and the electron mass m = 9.11×10−319.11 \times 10^{-31} kg. Give your answer to 3 significant figures.

mm

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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