A uniform magnetic field is restricted w...

A uniform magnetic field is restricted within a region of radius 1m. The magnetic field changes with time(t) as `vecB=B_0((2t)/3)hatk`. A loop of radius 2m is outside the region of magnetic field as shown in figure. The emf induced in loop is

Zero

`2/3piB_0`

`8/3piB_0`

`4/3piB_0`

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