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A helicopter has metallic blades with a ...

A helicopter has metallic blades with a length pf `3 m` extending outward from a central hub and rotating at `2rev//s`. If the vertical component of the earht's magnetic field is `50 mu T`, then the emf induced between the blade tip and the centre hub is

A

`4.95 V`

B

`2.83 mV`

C

`5.66 mV`

D

`11m V`

Text Solution

Verified by Experts

The correct Answer is:
B
The situation is as shown in the figure below.

Required induced emf,
`e = (B omega l^(2))/(2)`
or `e = (50 xx 10^(-6) xx 4 pi xx 9)/(2) = 2.83 m V`
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