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  • Consider a copper disc generator of radius r = 0.3 m rotating in a constant magnetic field of strength 0.5 T , with frecquency 30 rotaion / sec  Find the emf induced (in V ) in disc&

Consider a copper disc generator of radius r = 0.3 m rotating in a constant magnetic field of strength 0.5 T , with frecquency 30 rotaion / sec 

Find the emf induced (in V ) in disc 

Option: 1

4.2


Option: 2

3.4 V 


Option: 3

5.3


Option: 4

3.58


Answers (1)

best_answer

As we have learned

Motional E.m.f due to rotational motion -

Metal Disc

\varepsilon = \frac{1}{2}Bwr^{2}

- wherein

 

 

\varepsilon mf = 1/2 B w r ^2

 

= \frac{1}{2 } \times 0.5 \times 2 \times \pi \times 30 \times (0.3)^2= 4.239 V

 

 

 

Posted by

HARSH KANKARIA

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