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Wave Equation of EM Waves

In an electro...

Question

In an electromagnetic flow meter, the induced voltage is proportional to

A

flow rate

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B

square root of flow rate

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C

square of flow rate

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D

logarithm of flow rate

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Solution

The correct option is A flow rate
For electromagnetic flow meter
$E = B l v$
where
$E =$ output voltage
$B =$ Magnetic flux
$l =$ Diameter of pipe
$v =$ velocity of flow
$∴ E \propto v$

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