A wheel with 10 metallic spokes each 0.5...

A wheel with 10 metallic spokes each 0.5 m long, is rotated with a speed of 120 rpm. Please of the wheel is normal to earth's magnetic field at that place. If the magnitude of the field is 0.40 G, what is the induced emf between the axle and rim of the wheel?

`1.256 xx 10^-3V`

`1.256 xx 10^-4V`

`6.28 xx 10^-4V`

`6.28 xx 10^-5V`

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