Question

# A rod of length $$50\ cm$$ moves with a speed of $$10\ cm/s$$, in a uniform magnetic field of strength $$10\ G$$ at an angle of $$30^{o}$$ with the field. The emf induced across the ends of the rod is :

A
5000 CGS unit
B
2500 CGS unit
C
7500 CGS unit
D
1000 CGS unit

Solution

## The correct option is A $$2500\ CGS\ unit$$Given, Velocity,  $$V=10\,cm/s$$ Length of rod, $$L=50\,cm$$ Magnetic Field, $$B=10\,G$$ Motional $$emf=BlV\sin \theta =10\times 50\times 10\sin {{30}^{o}}=2500\,\ CGS\ unit$$ Physics

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