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Q.

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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a

1

b

12

c

$12 \times 10^{3}$

d

10

answer is B.

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Detailed Solution

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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