IB Physics HL D 3 4 Magnetic Force on Charge Questions

Calculate magnetic force on charged particles and conductors, determine its direction, and analyse charge motion, current-carrying wires and magnetic deflection.

Exam points

calculate the magnetic force on a charged particle or current-carrying conductor using charge, velocity or current, field strength and angle
determine magnetic-force direction and identify zero force when motion is parallel to the field, using charge sign and reference-frame evidence
analyse magnetic deflection, charge separation in moving conductors and forces between moving charges or current-carrying wires

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Study D.3.4—Magnetic force on charge conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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An electron moves in circular motion in a uniform magnetic field.

Figure for Question IB Physics HL D 3 4 Magnetic Force on Charge Questions question 1 — IB Physics HL

The velocity of the electron at point P is $6.8 \times 10^{5} \mathrm{~ms}^{-1}$ in the direction shown. The magnitude of the magnetic field is 8.5 T .

Calculate, in N , the magnitude of the magnetic force acting on the electron.

$1.60\times10^{-19}\times6.8\times10^{5}\times8.5=9.2\times10^{-13}\ \mathrm N$

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IB Physics HL D 3 4 Magnetic Force on Charge Questions question 1