State and explain Joule's law of heating. Deduce an expression for heat developed in a conductor due to the passage of an electric current.
Discuss how the current is established in a conductor when it is connected across a source of emf. Derive the relation J = nev, where the symbols have their usual meaning.
What are the factors on which the resistance of a conductor depends?
Why does a current carrying conductor kept in magnetic field shift from its position?
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