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Electricity and Magnetism
Quick questions on Magnetic fields and forces explained: H2 Physics Electricity and Magnetism
6short 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 magnetic flux density?Show answer
The magnetic flux density (the strength of a magnetic field) is defined through the force it exerts. For a straight wire of length carrying current at angle to a uniform field:
What is force on a moving charge?Show answer
A single charge moving at velocity through a field experiences:
What is circular motion in a uniform field?Show answer
A charge moving perpendicular to a uniform field follows a circular path, because the constant-magnitude force is always perpendicular to the velocity. The magnetic force provides the centripetal force:
What is q1?Show answer
State the factors that determine the size of the force on a current-carrying conductor in a magnetic field. [2 marks]
What is q2?Show answer
A wire carries over a length perpendicular to a field. Find the force on it. [2 marks]
What is q3?Show answer
Explain why a charged particle moving in a uniform magnetic field travels in a circle at constant speed. [3 marks]
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