IB Physics HL D 3 5 Force on Current Conductor Questions

Calculate magnetic force on current-carrying conductors and coils, determine its direction, and apply it to motors, moving rods and electromagnetic systems.

Exam points

calculate the magnetic force on a current-carrying conductor using field strength, current, conductor length and angle
determine force direction on wires, coils and loops from current and magnetic-field directions, including torque or rotation effects
explain how charge carriers produce force on conductors and analyse motor, moving-rod, force-balance and force-per-unit-length evidence

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Study D.3.5—Force on current conductor conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 3]

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)

Calculate the magnitude of the force per unit length on R.

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$\begin{aligned} \text { Use of } F=\text { BIL OR F/L = BI } =1.0 \text { « } \mathrm{N} \mathrm{~m}^{-1} \text { » } \text { } \end{aligned}$

(b)

Identify on the diagram the direction of the force on R.

[ 1 ]

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IB Physics HL D 3 5 Force on Current Conductor Questions question 1

Question (a)

Question (b)