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Module 6: Electromagnetism
Quick questions on Force on current-carrying conductors: HSC Physics Module 6
7short 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.
What is q1?Show answer
Write the formula for the force on a current-carrying wire in a magnetic field and define each symbol. [2 marks]
What is q2?Show answer
A straight wire of length carries at to a field. Calculate the force on the wire. [3 marks]
What is q3?Show answer
Two parallel wires apart each carry in the same direction. (a) Calculate the force per unit length between them. (b) State whether the force is attractive or repulsive.
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