IB Physics SL 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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In an experiment a student constructs the circuit shown in the diagram. The ammeter and the voltmeter are assumed to be ideal.

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

The diagram shows a cross-sectional view of the connecting wire in (c).

The wire which carries a current of 3.5 A into the page, is placed in a region of uniform magnetic field of flux density 0.25 T . The field is directed at right angles to the wire.

Determine the magnitude and direction of the magnetic force on one of the charge carriers in the wire.

$F=<q v B=1.6 \times 10^{-19} \times 2.0 \times 10^{-4} \times 0.25=>8.1 \times 10^{-24} \mathrm{~N}$

directed down OR south

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