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**1. Homework Statement**

A 40 cm rod is rotated about its centre inside a region of uniform magnetic field of 6.4 T. Given that the speed of rotation is 15 rad/s, find potential difference between the centre and either end of the rod

**2. Homework Equations**

emf = - ΔΦ / Δt

ω = 2π / T

**3. The Attempt at a Solution**

emf = - B cos θ . ΔA / Δt = - B . πr

^{2}/ T

I just need to plug the numbers with r = 20 cm (because from center to either end of rod)?

Thanks