§-Quick questions
NSWPhysicsModule 6: Electromagnetism
Quick questions on Force on current-carrying conductors: HSC Physics Module 6
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is force on a straight wire in a uniform field?Show answer
A wire of length carrying current in a uniform magnetic field experiences a force:
What are force between two long parallel wires?Show answer
Two long, straight, parallel wires carrying currents and separated by a distance exert magnetic forces on each other. The magnetic field at wire 2 due to wire 1 (at distance ) is:
What is historical definition of the ampere?Show answer
The pre-2019 SI definition of the ampere used parallel wires. One ampere was defined as the current in each of two infinite, parallel wires 1 m apart in vacuum that would produce a force per unit length of:
What are direction confusion for antiparallel currents?Show answer
Antiparallel parallel wires repel. The right-hand rule confirms: reversing one current flips the force on that wire.
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