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Q.

If the flux of magnetic induction through each turn of a coil of resistance R and having N turns changes from ϕ1 to ϕ2 then the magnitude of the charge that passes through the coil is

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a

ϕ2ϕ1R

b

Nϕ2ϕ1R

c

ϕ2ϕ1NR

d

NRϕ2ϕ1

answer is B.

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Detailed Solution

If flux present is ϕ,  flux linked with the coil is 

charge induced =ϕR=Nϕ2-ϕ1R

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If the flux of magnetic induction through each turn of a coil of resistance R and having N turns changes from ϕ1 to ϕ2 then the magnitude of the charge that passes through the coil is