A boat is moving due east in a region where the earth's magnetic field is 5.0 × 10^{-5} NA^{-1}m^{-1} due north and horizontal. The boat carries a vertical aerial 2m long. If the speed of the boat is 1.50 ms^{-1}, the magnitude of the induced emf is

- 0.15 mV
- 0.50 mV
- 0.75 mV
- 1 mV

**Answer**

E_{ind} = B x v x l

= 5.0 x 10^{-5} x 1.50 x 2

= 10.0 x 10^{-5} x 1.50

= 15 x 10^{-5}

= 0.15 mV

**The correct option is A.**