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