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CBSE Class 12 Physics 2024 All Sets Solved Paper

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Question : 3 of 14
Marks: +1, -0
The emf induced in a coil rotating in a magnetic field does not depend upon the following:
Solution:  
The induced in a coil of N turns is,
ε=− ddt(φ)ε = -\,\frac{d}{dt} (\varphi)
ε=− ddt[NBAcos⁡ωt]ε = -\,\frac{d}{dt} \left[ NBA \cos \omega t \right]
ε=NBAωsin⁡ωtε = NBA\omega \sin \omega t
∴ Induced emf is independent of resistance of the coil.
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