CAIE A-Level Physics A2 20.3.5 The Motio…ic Field

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An electron is travelling in a vacuum at a speed of $3.4 \times 10^{7} \mathrm{~m} \mathrm{~s}^{-1}$ . The electron enters a region of uniform magnetic field of flux density 3.2 mT , as illustrated in Fig. 8.1.

Fig. 8.1

The initial direction of the electron is at an angle of $30^{\circ}$ to the direction of the magnetic field.

When the electron enters the magnetic field, the component of its velocity $v_{\mathrm{N}}$ normal to the direction of the magnetic field causes the electron to begin to follow a circular path.

Calculate:

Calculate:
(i) $v_{\mathrm{N}}$

$\begin{aligned} v_{\mathrm{N}} =3.4 \times 10^{7} \times \sin 30^{\circ} =1.7 \times 10^{7} \mathrm{~m} \mathrm{~s}^{-1} \end{aligned}$

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CAIE A-Level Physics A2 20.3.5 The Motion of a Charged Particle Moving in a Uniform Magnetic Field Topic Practice

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