IB Physics HL D 4 4 Hl Lenzs Law Questions

Apply Lenz’s law to HL induction questions, predicting induced-current directions and magnetic forces in moving magnets, coils, rings, rods and damped systems.

Exam points

state Lenz’s law and use the change in magnetic flux to determine the direction of induced emf or conventional current in moving magnets, coils, rings and conductors
explain induced magnetic forces, eddy-current damping and motion changes by linking Lenz’s law to conservation of energy and the opposing change in flux
analyse induction in rails, rods, pendulums, transformers and coupled coils, including current direction, magnetic drag, terminal motion and energy dissipation

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Study D.4.4 (HL)—Lenz’s law conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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A rod, R , lies perpendicular to a uniform magnetic field B of strength 0.50 T directed into the plane of the page. R is connected to a circuit and the electric current $I_{\mathrm{R}}$ is 2.0 A .

A small coil of wire of radius 2.0 cm and 20 turns is now located with its centre 10.0 cm from R. The current in R is kept constant at 2.0 A .

Figure for Question IB Physics HL D 4 4 Hl Lenzs Law Questions question 1 — IB Physics HL

Deduce the direction of the current induced in (c)(ii).

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IB Physics HL D 4 4 Hl Lenzs Law Questions question 1