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 and apply Lenz’s law to determine the direction of induced current and magnetic force.
Explain how induced currents oppose changes in magnetic flux and produce damping or terminal motion.
Relate Lenz’s law to conservation of energy in moving coils, magnets and conductors.

[Maximum number: 2]

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