Q1
Electromagnetic induction refers to the production of:
📝 SolutionElectromagnetic induction is the phenomenon of generating an induced emf (and current, in a closed circuit) whenever the magnetic flux linked with a circuit changes.
Q2
Faraday's law of electromagnetic induction states that the induced emf is:
📝 SolutionFaraday's law states $\varepsilon = -\frac{d\phi}{dt}$: the induced emf equals the negative rate of change of magnetic flux linked with the circuit.
Q3
Lenz's law is a consequence of the conservation of:
📝 SolutionLenz's law states the induced current opposes the change causing it; this ensures work must be done against the induced effects, consistent with conservation of energy.
Q4
The negative sign in Faraday's law $\varepsilon = -\frac{d\phi}{dt}$ represents:
📝 SolutionThe negative sign shows that the induced emf always opposes the change in magnetic flux that produces it, which is exactly the statement of Lenz's law.
Q5
The emf induced in a straight conductor of length $L$ moving with velocity $v$ perpendicular to a magnetic field $B$ is:
📝 SolutionMotional emf is given by $\varepsilon = BvL$, arising from the magnetic force on free charges in the moving conductor pushing them along its length.
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Class 12 · Physics
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