Answer:
n = 4.25 x 10ā“ .
Explanation:
EMF required to be produced = 3 V .
Let n be the required no of turns .
rate of change of flux = n x B x A x f where n is no of turns of coil , B is magnetic field , A is area of coil and f is frequency of change .
B = .05 T , A = Ļ x (.015)Ā² = 7.065 x 10ā»ā“ mĀ² , f = 2
emf induced = rate of change of flux
= n x Ā .05 T x 7.065 x 10ā»ā“ mĀ² x 2
= .7065 x 10ā“ x n
Given
.7065 x 10ā»ā“ x n Ā = 3
n = 4.25 x 10ā“ .
