A conducting loop of resistance R and radius r has its center at the origin of the co-ordinate system in a magnetic field of induction B axis when it is rotated about Y-axis through 90°, the induced charge in the coil is directly proportional to
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(a, c)
Induced emf loop when the variation of flux 
during time dt is given as
⇒ The total charge induced in the loop 
using (1) and (2), 
where 
change in flux given as 
. ( 
) because initially to flux is linked with the coil and it has maximum flux linkage 
when turned through 
.
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