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TASPhysicsQuick questions
Unit 3: Gravity and Electromagnetism
Quick questions on Electromagnetic induction - TCE Physics (Tasmania)
3short 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?Show answer
Magnetic flux measures how much magnetic field passes through a loop of area :
What is faraday's law?Show answer
Faraday found that an EMF (voltage) is induced whenever the flux through a circuit changes. The size of the induced EMF is:
What is lenz's law?Show answer
The negative sign in Faraday's law represents Lenz's law: the induced current flows in the direction that opposes the change in flux producing it. If the flux is increasing, the induced current creates a field to oppose the increase; if it is decreasing, the induced current tries to maintain it. Lenz's law is a statement of conservation of energy. If the induced current aided the change, you would get energy for free.
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