The magnetic flux inside a coil changes uniformly from 12×10-3wb to 24×10-3wb in 12ms.The induced emf in (volts) will be ________

Given that 12×10-3wb ϕ2=24×10-3wb △ϕ=ϕ2-ϕ1=12×10-3w△t=12ms=12×10-3we=dϕdt=12×10-312×10-3=1volt

Given that 12×10-3wb ϕ2=24×10-3wb △ϕ=ϕ2-ϕ1=12×10-3w△t=12ms=12×10-3we=dϕdt=12×10-312×10-3=1volt

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The magnetic flux inside a coil changes uniformly from $12 \times 10^{- 3}$ wb to $24 \times 10^{- 3}$ wb in 12ms.The induced emf in (volts) will be ________

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$12 \times 10^{3}$

answer is B.

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Given that $12 \times 10^{- 3}$ wb $ϕ_{2} = 24 \times 10^{- 3}$ wb $△ ϕ = ϕ_{2} - ϕ_{1}$

$= 12 \times 10^{- 3} w$

$△ t = 12 m s = 12 \times 10^{- 3} w$

$e = \frac{d ϕ}{d t} = \frac{12 \times 10^{- 3}}{12 \times 10^{- 3}} = 1$ volt

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