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 2 m long. If the speed of the boat is 1.50 ms-1, the magnitude of the induced emf in the wire of aerial is?
0.15 mV
1 mV
0.75 mV
0.50 mV
Solution:
Induced emf is given by: ε = Bvl On putting the values we get = 5 × 10-5 × 1.50 × 2 = 0.15 mV