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 ________

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

1. A

12

2. B

1

3. C

$12×{10}^{3}$

4. D

10

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### Solution:

Given that $12×{10}^{-3}$wb ${\varphi }_{2}=24×{10}^{-3}$wb $△\varphi ={\varphi }_{2}-{\varphi }_{1}$

$=12×{10}^{-3}w$

$△t=12ms=12×{10}^{-3}w$

$e=\frac{d\varphi }{dt}=\frac{12×{10}^{-3}}{12×{10}^{-3}}=1$volt

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